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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 | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Business Combinations [Abstract] |  |  |  |
Beginning balance | $ 48,918 | $ 57,997 | $ 52,987 | $ 47,715
Additions to estimated acquisition earn-out payables | 955 | 2,136 | 2,787 | 15,055
Payments for estimated acquisition earn-out payables | (2,518) | (2,743) | (10,597) | (4,388)
Subtotal | 47,355 | 57,390 | 45,177 | 58,382
Change in fair value on estimated acquisition earn-out payables | (1,146) | 240 | 10 | (1,966)
Interest expense accretion | 481 | 618 | 1,503 | 1,832
Net change in earnings from estimated acquisition earn-out payables | (665) | 858 | 1,513 | (134)
Ending balance | $ 46,690 | $ 58,248 | $ 46,690 | $ 58,248

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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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