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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax provision	$ 17,247	$ 16,050	$ 34,466	$ 29,256
Liability for income taxes associated with uncertain tax positions	9,509		9,509
Net amount of unrecognized tax benefit related to uncertain tax positions that would impact, if recognized, effective income tax rate	1,405		1,405
Unrecognized tax benefit liabilities decrease	102		102
Increase in gross liability for uncertain tax positions	76		209
Provision expense (benefit) for income taxes related to interest and penalties	123,000	$ 62,000	6,000	$ 109,000
Income tax accrued for payment of interest and penalties	$ 1,612		$ 1,612		$ 1,618

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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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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