Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
income tax benefits reflected in additional paid-in-capital		$ 1,004	$ 772	$ (133)
Increase (Decrease) in valuation allowance due to state net operating loss and tax credit carryforwards		(100)	300
State net operating loss carryforwards		23,900
State tax credit carryforwards		1,500
Unrecognized tax benefits that would impact effective tax rate		2,600
Reductions in the liability for unrecognized tax benefits due to expiration of statues of limitation		300
Accrued interest expense		200	200
Liability for interest expense		400	300
Liability for penalties		300	300
2013 and 2014 [Member] | Internal Revenue Service [Member]
Income Tax Contingency [Line Items]
Audit settlement, net	$ 500
Non-Qualified Stock Option [Member] | Restricted Stock Awards [Member]
Income Tax Contingency [Line Items]
income tax benefits reflected in additional paid-in-capital		$ 1,100	$ 900	$ 500