| **Income Taxes - Schedule of Components of Income Tax Provision (Benefit) (Detail) (USD $)In Thousands, unless otherwise specified** | 12 Months Ended                                  |
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| **Income Tax Disclosure [Abstract]**                                                                                                 |                                             |   |   |
| Federal                                                                                                                              | $ 12,661us-gaap_CurrentFederalTaxExpenseBenefit  | $ 2,509us-gaap_CurrentFederalTaxExpenseBenefit | $ 12,035us-gaap_CurrentFederalTaxExpenseBenefit |
| State                                                                                                                                | 157us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 68us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 72us-gaap_CurrentStateAndLocalTaxExpenseBenefit |
| Total current tax provision                                                                                                          | 12,818us-gaap_CurrentIncomeTaxExpenseBenefit     | 2,577us-gaap_CurrentIncomeTaxExpenseBenefit | 12,107us-gaap_CurrentIncomeTaxExpenseBenefit |
| Deferred tax provision (benefit)                                                                                                     | 4,862us-gaap_DeferredIncomeTaxExpenseBenefit     | 12,704us-gaap_DeferredIncomeTaxExpenseBenefit | 2,551us-gaap_DeferredIncomeTaxExpenseBenefit |
| Total tax provision (benefit), Amount                                                                                                | $ 17,680us-gaap_IncomeTaxExpenseBenefit          | $ 15,281us-gaap_IncomeTaxExpenseBenefit | $ 14,658us-gaap_IncomeTaxExpenseBenefit |

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| - Definition
Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.
+ References
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| - Definition
Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.
+ References
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| - Definition
Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.
+ References
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| - Definition
Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.
+ References
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| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
+ References
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