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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Provision (benefit) for income taxes for continuing operations |  | $ 6,255 | $ 9,890 | $ 17,880 | $ 27,576 |
Effective income tax rate |  | 28.00% | 39.90% | 27.80% | 39.00% |
Valuation allowance |  | $ 2,800 |  | $ 2,800 |  | $ 2,800
Net deferred tax asset |  | 36,200 |  | 36,200 |  | 32,500
Net current tax asset |  | $ 3,000 |  | $ 3,000 |  | $ 5,800
ASU 2018-02 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Impact on retained earnings of adopting recent accounting pronouncement | $ 399 |  |  |  |  |

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- Definition Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act. + References No definition available. + Details
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