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Additions, Payments, and Net Changes, as well as Interest Expense Accretion on Estimated Acquisition Earn-Out Payables (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Business Combinations [Abstract]      
Beginning balance $ 52,987 $ 47,715 $ 29,608
Additions to estimated acquisition earn-out payables 5,816 21,479 30,525
Payments for estimated acquisition earn-out payables (18,278) (17,625) (10,212)
Subtotal 40,525 51,569 49,921
Change in fair value on estimated acquisition earn-out payables 570 (1,051) (4,043)
Interest expense accretion 1,963 2,469 1,837
Net change in earnings from estimated acquisition earn-out payables 2,533 1,418 (2,206)
Ending balance $ 43,058 $ 52,987 $ 47,715