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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]        
Income (loss) from equity method investments in affiliates $ 1,331 $ 187 $ 2,677 $ (162)
Strong Upwind Holdings LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Income (loss) from equity method investments in affiliates $ 1,300 $ 200 $ 2,700 $ (200)