Goodwill and Other Intangible Assets - Summary of Amortized Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 7,993	$ 6,090	$ 23,104	$ 16,294
Services cost of revenues
Finite-Lived Intangible Assets [Line Items]
Amortization expense	1,875	1,906	5,641	5,773
Amortization of intangible assets
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 6,118	$ 4,184	$ 17,463	$ 10,521