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Stock-Based Awards - Summary of Stock Options, Restricted Stock and Restricted Stock Unit Activity (Detail)
3 Months Ended
Mar. 31, 2018
shares
Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options, beginning balance 1,158,828
Options, Granted 0
Options, Exercised/vested (173,291)
Options, Forfeitures 0
Options, ending balance 985,537
Restricted Stock Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted Stock, beginning balance 1,816,666
Restricted Stock, Granted 730,028
Restricted Stock, Exercised/vested (164,028)
Restricted Stock, Forfeitures (63,609)
Restricted Stock, ending balance 2,319,057
Restricted Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted Stock, beginning balance 5,678
Restricted Stock, Granted 7,152
Restricted Stock, Exercised/vested (734)
Restricted Stock, ending balance 12,096