Goodwill and Intangibles - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Aggregate amortization expense	$ 577	$ 687
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful lives	2 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful lives	10 years