Goodwill and Identified Intangible Assets - Allocation (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 for identified intangibles	$ 20,520	$ 27,329	$ 29,204
Cost of revenue [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense for identified intangibles	13,745	19,233	20,499
Operating expense [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense for identified intangibles	$ 6,775	$ 8,096	$ 8,705