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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
Income Taxes [Line Items]
Income tax expense (benefit)	$ 15,164	$ 18,547	$ 26,808	$ 34,719
Effective tax rate	24.80%	38.70%	23.70%	36.40%
Excess tax benefits from discrete items	$ 600	$ 0	$ 2,300	$ 800
Income tax expense credit				$ 1,200
Effect of reporting discrete items during the period	1.00%		2.00%
Statutory Effective Tax Rate [Member]
Income Taxes [Line Items]
Effective tax rate			24.70%
State income tax rate, net of federal benefit			3.70%
U.S. federal statutory rate			21.00%
Forecast [Member]
Income Taxes [Line Items]
Effective tax rate					25.70%

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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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