Stock Incentive Plans - Summary of Activity Relating to Stock Options Awards (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares, Options outstanding at beginning of period	892,532	435,340
Shares, Assumed from acquisitions	207,645	1,707,036
Shares, Exercised	(131,792)	(24,806)
Shares, Forfeited	(49,281)	(92,650)
Shares, Options outstanding and exercisable at end of period	919,104	2,024,920
Weighted Average Exercise Price, Options outstanding at beginning of period	$ 8.95	$ 8.86
Weighted Average Exercise Price, Assumed from acquisitions	8.92	7.83
Weighted Average Exercise Price, Exercised	9.44	6.38
Weighted Average Exercise Price, Forfeited	10.91	6.69
Weighted Average Exercise Price, Options outstanding and exercisable at end of period	$ 8.77	$ 8.12