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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Taxes [Line Items]
Increase in income tax expense	$ 1,572
Income tax expense	3,526	$ 1,954	$ 6,966	$ 5,015
One time income tax adjustment related tax cuts and jobs act	$ 1,089
Federal income tax rate			21.00%		35.00%
Effective tax rate without adjustments	23.10%		23.80%
Scenario, Plan
Income Taxes [Line Items]
Federal income tax rate	33.40%	32.10%	28.20%	29.20%

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Effective income tax Rate continuing operations without adjustment.

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Income taxes.

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One time income tax adjustment related tax cuts and jobs act of 2017.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes, and in deferred and other tax liabilities and assets.

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