Stock-Based Compensation - Schedule of Nonvested Stock Option Outstanding (Detail) - Stock Incentive Plan 2013 - Employee Stock Option	3 Months Ended
	Mar. 31, 2017 $ / shares shares
Shares
Nonvested at beginning of period (in shares) | shares	704,421
Granted (in shares) | shares	45,134
Forfeited (in shares) | shares	(750)
Vested during period (in shares) | shares	(324,346)
Nonvested at end of period (in shares) | shares	424,459
Weighted- Average Exercise Price
Nonvested at beginning of period (in dollars per share) | $ / shares	$ 19.08
Granted (in dollars per share) | $ / shares	47.05
Forfeited (in dollars per share) | $ / shares	15.83
Vested during period (in dollars per share) | $ / shares	17.01
Nonvested at end of period (in dollars per share) | $ / shares	$ 23.64