Commitments and Contingencies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Rent expenses	$ 5,800,000	$ 4,500,000	$ 2,300,000
Possible loss estimated minimum	0
Possible loss estimated maximum	6,000,000
Amount accrued for estimation of loss	0
Recognized loss contingency	$ 0	$ 0