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Activity with Respect to Options Granted (Detail) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Shares    
Beginning balance, shares 6,578,522  
Granted, shares 519,791  
Forfeited, shares (272,399)  
Exercised, shares (419,504)  
Expired, shares (111,218)  
Ending balance, shares 6,295,192 6,578,522
Nonvested, shares 2,333,232 3,106,083
Weighted Average Exercise Price    
Beginning Balance, Weighted Average Exercise Price $ 87.52  
Granted, Weighted Average Exercise Price 38.87  
Forfeited, Weighted Average Exercise Price 50.26  
Exercised, Weighted Average Exercise Price 46.85  
Expired, Weighted Average Exercise Price 117.89  
Ending Balance, Weighted Average Exercise Price 87.29 $ 87.52
Nonvested, Weighted Average Exercise Price $ 58.97  
Weighted Average Remaining Contractual Term (years)    
Weighted Average Remaining Contractual Term (years) 7 years 4 months 24 days 8 years
Nonvested, Weighted Average Remaining Contractual Term (years) 8 years 9 months 18 days  
Aggregate Intrinsic Value    
Shares, Outstanding, Aggregate Intrinsic Value $ 318,349 $ 18,442
Exercised, Aggregate Intrinsic Value 18,366  
Nonvested, Aggregate Intrinsic Value $ 151,369