Goodwill and Intangible Assets, Net - Additional Information (Detail) - USD ($)		12 Months Ended
	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill		$ 51,889,000	$ 51,889,000
Goodwill impairment amount	$ 0	$ 0	0	$ 0
Weighted average remaining useful life		3 years 7 months 6 days
Amortization of intangible assets		$ 1,600,000	$ 1,600,000	$ 1,600,000