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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Contingency [Line Items] |  |  |  |  |
income tax benefit reflected in additional paid-in-capital |  |  |  | $ 1,004 | $ 772
Tax Cuts and Jobs Act of 2017, income tax benefit |  |  | $ 2,500 |  |
Effective income tax rate |  |  | 31.30% | 39.40% | 39.50%
Corporate income tax |  |  | 35.00% |  |
Tax reduction due to ASU 2016-09 & Tax Act |  |  | 8.50% |  |
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 |  |  |  | $ (100) |
State net operating loss carryforwards |  |  | 28,000 |  |
State tax credit carryforwards |  |  | 1,400 |  |
Unrecognized tax benefits that would impact effective tax rate |  |  | 2,900 |  |
Reductions in the liability for unrecognized tax benefits due to expiration of statues of limitation |  |  | 1,200 |  |
Accrued interest expense |  |  | 200 | 200 |
Liability for interest expense |  |  | 600 | 400 |
Liability for penalties |  |  | $ 300 | 300 |
Earliest Tax Year [Member] | State [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Net operating loss carryforwards experiation period |  |  | 2018 |  |
Tax credit carryforwards experiation period |  |  | 2018 |  |
Latest Tax Year [Member] | State [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Net operating loss carryforwards experiation period |  |  | 2037 |  |
Tax credit carryforwards experiation period |  |  | 2028 |  |
2013 and 2014 [Member] | Internal Revenue Service [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Audit settlement, net |  | $ 500 |  |  |
Scenario, Forecast |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Corporate income tax | 21.00% |  |  |  |
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 | $ 900
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 |  |  | $ 3,800 |  |

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