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Selected Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Interim Reporting [Line Items]                      
Net revenues $ 12,404 $ 162,354             $ 174,758    
Net income (loss) $ 53,976 $ 126,520 $ (29,959) $ (24,873) $ (277,020) $ (31,857) $ (28,910) $ (30,658) $ 125,664 $ (368,445) $ (198,382)
Net income (loss) per share - basic $ 0.56 $ 1.32 $ (0.33) $ (0.29)         $ 1.37 $ (4.54) $ (2.57)
Net loss per share - basic and diluted         $ (3.30) $ (0.39) $ (0.36) $ (0.38)      
Net income (loss) per share - diluted $ 0.56 $ 1.31 $ (0.33) $ (0.29)         $ 1.36 $ (4.54) $ (2.57)
Weighted average common shares used to compute basic and diluted net loss per share         83,862 81,039 80,203 79,783      
Weighted average common shares used to compute basic net income (loss) per share 95,676 95,627 91,061 85,771         92,053 81,233 77,045
Weighted average common shares used to compute diluted net income (loss) per share 96,510 96,548 91,061 85,771         92,085 81,233 77,045