Goodwill and Other Intangible Assets - Summary of Amortized Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 31,094	$ 23,789	$ 19,199
Services cost of revenue [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	7,513	7,668	7,580
Amortization of intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 23,581	$ 16,121	$ 11,619