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Acquisition - Summary of Purchase Price Allocation (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Business Acquisition [Line Items]    
Goodwill $ 3,557,446 $ 3,546,034
2015 Acquisitions [Member]    
Business Acquisition [Line Items]    
Trade and other receivables   521
Prepaid expenses and other   996
Property and equipment   197
Goodwill   9,561
Other intangible assets   39,876
Deferred tax liabilities   (2,336)
Liabilities assumed   (2,437)
Aggregate purchase prices   $ 46,378