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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |
Effective income tax rate reconciliation at federal statutory income tax rate |  |  | 21.00% | 35.00% |
Income Tax Expense (Benefit) | $ 5,338 | $ 10,728 | $ 21,209 | $ 32,321 |
Effective Income Tax Rate Reconciliation, Percent | 53.40% | 36.20% | 26.80% | 34.20% |
Deferred Income Tax Assets, Net |  |  |  |  | $ 3,100

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