Stock-Based Compensation - Summary of Restricted Common Shares (Detail) - Restricted Stock And Units [Member]	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested Number, Beginning Balance (in shares) | shares	313,345
Granted (in shares) | shares	207,538
Vested (in shares) | shares	(129,342)
Forfeited (in shares) | shares	(58,560)
Non-vested Number, Ending Balance (in shares) | shares	332,981
Non-vested Weighted Average Grant Date Fair Value, Beginning Balance (in dollars per share) | $ / shares	$ 94.75
Granted (in dollars per share) | $ / shares	66.12
Vested (in dollars per share) | $ / shares	83.87
Forfeited (in dollars per share) | $ / shares	91.48
Non-vested Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share) | $ / shares	$ 83.60