Summary of Change in Fair Value of Level Three Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unrealized gain (loss) recognized in other expenses	$ 400	$ (1,000)	$ 300
Indemnification Assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	6,099	7,464	14,836
Payments received	(2,130)	(2,331)	(7,080)
Unrealized gain (loss) recognized in other expenses	(383)	966	(292)
Net settlement of derivative
Realized loss on derivative
Ending balance	3,586	6,099	7,464
Derivative Assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance			4,960
Payments received
Unrealized gain (loss) recognized in other expenses
Net settlement of derivative			(3,561)
Realized loss on derivative			(1,399)
Ending balance