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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Line Items] |  |  |  |  |
U.S. federal statutory rate |  | 35.00% | 35.00% | 35.00% |
Net income tax benefit attributable to passage of the TCJA |  | $ 9,955 |  |  |
Percentage of income attributable to wholly-owned operations and investments for which income tax expense and effective tax rate calculated |  | 100.00% |  |  |
Valuation allowance |  | $ 0 | $ 0 |  |
Gross unrecognized tax benefits |  | 4,225 | 3,695 | $ 3,513 | $ 3,719
Unrecognized tax benefits that, if recognized, would affect the effective tax rate |  | 3,457 | 2,573 |  |
Estimated accrued interest and penalties resulting from unrecognized tax benefits |  | $ 540 | $ 414 |  |
Scenario, Forecast |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
U.S. federal statutory rate | 21.00% |  |  |  |
Minimum |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
State and other net operating loss carry forwards expiration date |  | 2018 |  |  |
Maximum |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
State and other net operating loss carry forwards expiration date |  | 2037 |  |  |
State and other |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss carry forwards |  | $ 7,606 |  |  |
Federal |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss carry forwards |  | $ 0 |  |  |

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