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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax provision	$ 17,219	$ 13,206
Liability for income taxes associated with uncertain tax positions	9,585
Net amount of unrecognized tax benefit related to uncertain tax positions that would impact, if recognized, effective income tax rate	1,644
Unrecognized tax benefit liabilities decrease	123
Increase in gross liability for uncertain tax positions	285
Provision expense (benefit) for income taxes related to interest and penalties	117	$ 47,000
Income tax accrued for payment of interest and penalties	$ 1,735		$ 1,618

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (d)(3)
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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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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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