Company's Deferred Tax Assets, Net of Deferred Tax Liabilities and Valuation Allowance (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Deferred tax assets, net of deferred tax liabilities	$ 14,165	$ 12,242
Valuation allowance	(832)	(832)
Deferred tax assets, net of deferred tax liabilities and valuation allowance	$ 13,333	$ 11,410