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Share-Based Compensation - Income Tax Benefit Recognized for our Share-Based Compensation Arrangements (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Total share-based compensation cost	$ 18,858us-gaap_ShareBasedCompensation	$ 14,854us-gaap_ShareBasedCompensation	$ 12,374us-gaap_ShareBasedCompensation
Income tax benefit	$ 7,334us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	$ 5,777us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	$ 4,812us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense

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- Details

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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