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Business Combinations - Additions, Payments, and Net Changes, as well as Interest Expense Accretion on Estimated Acquisition Earn-Out Payables (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Business Combinations [Abstract]        
Beginning balance $ 52,696,000 $ 48,918,000 $ 43,058,000 $ 52,987,000
Additions to estimated acquisition earn-out payables (221,000) 955,000 14,586,000 2,787,000
Payments for estimated acquisition earn-out payables (463,000) (2,518,000) (11,892,000) (10,597,000)
Subtotal 52,012,000 47,355,000 45,752,000 45,177,000
Change in fair value on estimated acquisition earn-out payables (247,000) (1,146,000) 4,981,000 10,000
Interest expense accretion 561,000 481,000 1,593,000 1,503,000
Net change in earnings from estimated acquisition earn-out payables 314,000 (665,000) 6,574,000 1,513,000
Ending balance $ 52,326,000 $ 46,690,000 $ 52,326,000 $ 46,690,000