Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Income tax benefit reflected in additional paid-in-capital				$ 1,004
Tax Cuts and Jobs Act of 2017, income tax benefit			$ 2,500
Effective income tax rate		22.90%	31.30%	39.40%
Corporate federal income tax rate		21.00%	35.00%
Change in valuation allowance for deferred tax assets related to tax reform act			$ 300
Increase (Decrease) in valuation allowance due to state net operating loss and tax credit carryforwards		$ 200
State net operating loss carryforwards		23,200
State tax credit carryforwards		1,400
Unrecognized tax benefits that would impact effective tax rate		1,900
Reductions in the liability for unrecognized tax benefits due to expiration of statues of limitation		100
Accrued interest expense			200
Liability for interest expense		700	700
Liability for penalties		200	200
Maximum [Member]
Income Tax Contingency [Line Items]
Accrued interest expense		$ 100
Earliest Tax Year [Member] | State [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards expiration period		2019
Net operating loss carryforwards expiration period		2019
Latest Tax Year [Member] | State [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards expiration period		2038
Net operating loss carryforwards expiration period		2028
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 benefit reflected in additional paid-in-capital				$ 1,100
Non-Qualified Stock Option [Member] | Restricted Stock Awards [Member] | Income Tax Expenses [Member]
Income Tax Contingency [Line Items]
Income tax benefit reflected in additional paid-in-capital		$ 3,300	$ 3,800