Stockholders' Equity - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended	9 Months Ended
	May 31, 2016	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Feb. 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option available for future grants (in shares)		1,400,000	1,400,000
Tax payments, for net share settlement of share based award			$ 2,830,000	$ 1,299,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value price per share (in dollars per share)		$ 22.67	$ 22.67
Total intrinsic value of options exercised			$ 2,600,000	1,800,000
Number of options outstanding (in shares)		831,000	831,000		1,008,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense related to non-vested stock options		$ 36,500,000	$ 36,500,000
Weighted average period over which costs are recognized			2 years 9 months 29 days
Approximate units outstanding (in shares)		2,016,000	2,016,000		1,330,000
Performance Based Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approximate units of performance restricted stock granted (in shares)			200,000
Approximate units outstanding (in shares)		300,000	300,000
Maximum additional shares to be issued		200,000	200,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares withheld, for net share settlement of share based award			100,000
Tax payments, for net share settlement of share based award			$ 2,800,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options outstanding (in shares)		200,000	200,000
Unvested performance options (in shares)		29,350	29,350
Unvested shares, expected to vest		25,000	25,000
2016 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized	2,000,000.0
Outstanding common stock repurchase program authorized amount (up to)						$ 50,000,000.0
Shares repurchased during period		0	0
Cost of shares repurchased				$ 33,800,000
Average cost of shares repurchased (in dollars per share)				$ 18.90
Average price of shares repurchased (in dollars per share)				$ 18.87
Remaining authorized repurchase amount		$ 16,200,000	$ 16,200,000
Rule 10b5-1 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased during period				1,800,000