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Equity - Additional Information (Detail) (USD $)
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0 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended | ||||||||
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Apr. 23, 2013
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Aug. 31, 2014
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Sep. 30, 2014
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Sep. 30, 2013
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Apr. 23, 2013
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Aug. 31, 2014
Scenario Forecast [Member]
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Sep. 30, 2014
Scenario Forecast [Member]
Directors, Officers and Other Employees [Member]
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Apr. 23, 2013
OP Units [Member]
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Aug. 31, 2014
OP Units [Member]
Scenario Forecast [Member]
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Apr. 23, 2013
Performance Based Restricted Stock Award [Member]
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Sep. 30, 2014
Restricted Incentive [Member]
2013 Plan [Member]
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Sep. 30, 2013
Restricted Incentive [Member]
2013 Plan [Member]
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Sep. 30, 2014
Restricted Incentive [Member]
2013 Plan [Member]
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Sep. 30, 2013
Restricted Incentive [Member]
2013 Plan [Member]
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Sep. 30, 2014
Restricted Incentive [Member]
2013 Plan [Member]
Date One [Member]
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Sep. 30, 2014
Restricted Incentive [Member]
2013 Plan [Member]
Date Two [Member]
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Sep. 30, 2014
Restricted Common Stock [Member]
2013 Plan [Member]
Employees and Directors [Member]
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Sep. 30, 2014
Restricted Common Stock [Member]
2013 Plan [Member]
Certain Employees [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||||||
| Registration of IPO Common Stock, date registered | Aug. 31, 2014 | |||||||||||||||||
| Sale of stock, description of transaction | In August 2014, we filed a registration statement with the SEC registering the resale, from time to time, by certain persons of up to 3,178,410 shares of common stock, comprised of: (1) 1,741,238 shares of common stock issued in connection with our formation transactions at the time of our IPO, (2) 331,282 shares of common stock issuable upon exchange of OP units issued in connection with our formation transactions, which are exchangeable on a one-for-one basis, into cash or, at our option, shares of our common stock and (3) 1,105,890 shares of common stock granted under the 2013 Plan to our directors, officers and other employees. | |||||||||||||||||
| Sale of stock | 3,178,410 | |||||||||||||||||
| Shares of common stock issued in connection formation transactions | 1,741,238 | |||||||||||||||||
| Shares of common stock issuable upon exchange of OP units issued | 331,282 | |||||||||||||||||
| Common stock exchangeable ratio | Exchangeable on a one-for-one basis, into cash or, at our option, shares of our common stock | |||||||||||||||||
| Shares of common stock granted to directors, officers and other employees | 1,105,890 | |||||||||||||||||
| Proceeds from the sale of the shares | $ 0 | $ 70,370,000 | $ 160,092,000 | |||||||||||||||
| Sale of Stock, Cost | 100,000 | |||||||||||||||||
| Sale of common stock, value | 500,000,000 | |||||||||||||||||
| Number of shares received by employees through reallocation | 202,826 | 135,938 | 128,348 | |||||||||||||||
| Value per share under stock based compensation plan | $ 12.50 | |||||||||||||||||
| Compensation expense | 5,800,000 | 5,800,000 | 5,800,000 | |||||||||||||||
| Income tax benefits on reallocation | 0 | |||||||||||||||||
| Shares awarded | 149,359 | 379,741 | ||||||||||||||||
| Restricted common shares vesting years | vest in 2015 through 2018 | |||||||||||||||||
| Assumed forfeiture rate for calculation of compensation expense | 5.00% | |||||||||||||||||
| Equity-based compensation expense | 1,700,000 | 400,000 | 3,600,000 | 6,600,000 | ||||||||||||||
| Additional restricted stock awards authorized upon achievement of certain corporate and individual performance goals | 163,868 | |||||||||||||||||
| Restricted common stock, vesting date | Dec. 31, 2015 | Dec. 31, 2016 | ||||||||||||||||
| Unrecognized compensation expense | 10,400,000 | 10,400,000 | ||||||||||||||||
| Weighted-average term in which unrecognized compensation expense is expected to be recognized | 2 years | |||||||||||||||||
| Income tax expense | $ 500,000 | |||||||||||||||||