Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Impairment losses	$ 0	$ 0
Intangible assets, amortization method	straight-line basis
Amortization expense recognized	$ 413	$ 149	$ 0
Minimum [Member]
Goodwill [Line Items]
Intangible assets, estimated useful life	3 years
Maximum [Member]
Goodwill [Line Items]
Intangible assets, estimated useful life	7 years