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Stock-Based Compensation - Summary of Restricted Stock Units Activity (Detail) - Restricted Stock Units (RSUs) [Member]
9 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested Number, Beginning balance | shares 1,020,930
Number, Granted | shares 414,405
Number, Vested, including shares withheld to cover taxes | shares (423,909)
Number, Forfeited | shares (60,129)
Nonvested Number, Ending balance | shares 951,297
Nonvested Weighted Average Grant Date Fair Value, Beginning balance | $ / shares $ 36.10
Weighted Average Grant Date Fair Value, Granted | $ / shares 56.15
Weighted Average Grant Date Fair Value, Vested, including shares withheld to cover taxes | $ / shares 33.87
Weighted Average Grant Date Fair Value, Forfeited | $ / shares 42.52
Nonvested Weighted Average Grant Date Fair Value, Ending balance | $ / shares $ 45.42
Fair Value, Vested, including shares withheld to cover taxes | $ $ 14,357,798
Fair Value, Nonvested at end of period | $ $ 52,977,730