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Fair Value Measurements - Change in Level 3 Fair Values of Contingent Purchase Price Liability (Detail) (Level 3 [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Ending balance $ (25,196) $ (30,012)
Contingent Purchase Price Payable [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance (30,012) (25,325)
Additions from business acquisitions (5,487) (17,611)
Payment of contingent purchase price payable 11,511 11,970
Change in fair value of contingencies (1,102) 1,135
Change in net present value of contingencies (106) (181)
Ending balance $ (25,196) $ (30,012)