Quarterly report pursuant to Section 13 or 15(d)

Equity Method Investments in Affiliate - Additional Information (Detail)

v3.5.0.2
Equity Method Investments in Affiliate - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Schedule of Equity Method Investments [Line Items]        
Income (loss) from equity method investments in affiliates $ 1,076 $ (295) $ 1,346 $ (348)
Strong Upwind Holdings LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Income (loss) from equity method investments in affiliates $ 1,100 $ (300) $ 1,300 $ (300)