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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	Dec. 31, 2017
Income Taxes [Line Items]
Provision for income taxes increased	$ 7,548	$ 6,204	$ 12,377	$ 12,273
Effective income tax rate	25.50%	39.40%	24.50%	38.20%
Federal corporate tax rate			21.00%			35.00%
Scenario, Plan [Member] | Minimum [Member]
Income Taxes [Line Items]
Effective income tax rate					24.50%
Scenario, Plan [Member] | Maximum [Member]
Income Taxes [Line Items]
Effective income tax rate					25.50%

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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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