Quarterly report pursuant to Section 13 or 15(d)

Equity Method Investments - Additional Information (Detail)

v3.7.0.1
Equity Method Investments - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Schedule of Equity Method Investments [Line Items]    
Income (loss) from equity method investments $ 4,171 $ 270
Strong Upwind Holdings LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Income (loss) from equity method investments $ 4,200 $ 300