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Business Combinations (Estimated Acquisition Earn-Out Payables) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |
Balance as of the beginning of the period | $ 57,997 | $ 41,913 | $ 47,715 | $ 29,609
Additions to estimated acquisition earn-out payables | 2,136 | 1,648 | 15,055 | 15,463
Payments for estimated acquisition earn-out payables | (2,743) | (2,290) | (4,388) | (5,267)
Sub Total | 57,390 | 41,271 | 58,382 | 39,805
Change in fair value on estimated acquisition earn-out payables | 240 | (1,286) | (1,966) | (697)
Interest expense accretion | 618 | 476 | 1,832 | 1,353
Net change in earnings from estimated acquisition earn-out payables | 858 | (810) | (134) | 656
Balance as of June 30 | $ 58,248 | $ 40,461 | $ 58,248 | $ 40,461

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