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Stock-based Compensation Plans - Additional Information 2 (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-based compensation expense $ 25,538 [1] $ 13,954
Restricted Stock Equity Awards    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Granted 1,783,446 870,000
Granted, weighted average grant date fair value $ 17.00 $ 32.98
Vesting period 3 years  
Stock-based compensation expense $ 6,500 $ 6,000
Restricted Stock Liability Awards    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Granted 673,791 66,000
Granted, weighted average grant date fair value $ 15.21 $ 32.67
Vesting period 3 years 3 years
Stock-based compensation expense $ 8,100 $ 2,700
[1] Includes $18.2 million accelerated vesting of equity grants.