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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |  |  |
Income tax expense (benefit) | $ 15,164 | $ 18,547 | $ 26,808 | $ 34,719 |
Effective tax rate | 24.80% | 38.70% | 23.70% | 36.40% |
Excess tax benefits from discrete items | $ 600 | $ 0 | $ 2,300 | $ 800 |
Income tax expense credit |  |  |  | $ 1,200 |
Effect of reporting discrete items during the period | 1.00% |  | 2.00% |  |
Statutory Effective Tax Rate [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Effective tax rate |  |  | 24.70% |  |
State income tax rate, net of federal benefit |  |  | 3.70% |  |
U.S. federal statutory rate |  |  | 21.00% |  |
Forecast [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Effective tax rate |  |  |  |  | 25.70%

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