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Acquisitions - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill	$ 1,213,809,000	$ 1,218,733,000
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Purchase price allocation, Acquisition-related contingent consideration		4,700,000
Acquisition related to identifiable intangible assets		9,500,000
Purchase price allocation, deferred tax liability		1,200,000
Goodwill		$ 10,100,000

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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount of deferred tax liability attributable to taxable temporary differences due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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