Retirement Plan - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Compensation And Retirement Disclosure [Abstract]
Maximum defined contribution plan employees contributions, percentage	100.00%
Percentage of participant contributions considered for first condition of plan	100.00%
Description of percentage of employees eligible earnings subject to match	The Company matches 100% of the first 3% of employee contributions and 50% of the next 2% of employee contributions.
Percentage of participant salary under first condition of plan	3.00%
Percentage of participant contributions considered for second condition of plan	50.00%
Percentage of participant salary under second condition of plan	2.00%
Employer matching contributions to the plan	$ 3.5	$ 2.7	$ 1.9