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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, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Provision for income taxes increased	$ 7,150	$ 2,210	$ 16,371	$ 10,060
Effective income tax rate	21.70%	16.00%	23.30%	29.80%
Federal corporate tax rate			21.00%			35.00%
Scenario, Plan [Member] | Minimum [Member]
Income Taxes [Line Items]
Effective income tax rate					23.00%
Scenario, Plan [Member] | Maximum [Member]
Income Taxes [Line Items]
Effective income tax rate					24.00%

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Income taxes.

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

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