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Stock-Based Compensation - Summary of Performance Unit Activity (Detail) - Performance Units
shares in Thousands
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Stock Units, Outstanding, Beginning Balance (shares) | shares 176
Stock Units, Granted (shares) | shares 389
Stock Units, Vested (shares) | shares (17)
Stock Units, Forfeited (shares) | shares (41)
Stock Units, Outstanding, Ending Balance (shares) | shares 507
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted Average Grant Date Fair Value, Outstanding, Beginning Balance (in dollars per share) | $ / shares $ 71.49
Weighted Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares 61.88
Weighted Average Grant Date Fair Value, Vested (in dollars per share) | $ / shares 98.28
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share) | $ / shares 92.83
Weighted Average Grant Date Fair Value, Outstanding, Ending Balance (in dollars per share) | $ / shares $ 61.48