Goodwill and Other Intangible Assets - Summary of Amortized Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 7,260	$ 7,993	$ 23,221	$ 23,104
Services cost of revenues
Finite-Lived Intangible Assets [Line Items]
Amortization expense	1,911	1,875	5,636	5,641
Amortization of intangible assets
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 5,349	$ 6,118	$ 17,585	$ 17,463