Defined Contribution Plans - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Employer-matching contribution (percent)					50.00%
Employer matching contribution, percent of employee's gross pay					6.00%
Employees initial service period (years)					5 years
401(k) Employer matching contribution, percent match, first 3%			100.00%
401(k) Employer matching contribution, percent match, remaining 2%			50.00%
Contributions of eligible employee pretax salary (percent) (up to)			100.00%
Annual deferral limit			$ 18,000	$ 18,000
Amount of employer contributions during period	$ 800,000	$ 400,000	$ 1,900,000	$ 800,000