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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 ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Business Combinations [Abstract] |  |  |  |
Additions to estimated acquisition earn-out payables | $ 21,480 | $ 14,527 | $ 27,134 | $ 14,807
Payments for estimated acquisition earn-out payables | (9,448) | (10,814) | (14,039) | (11,429)
Subtotal | 89,741 | 52,519 | 88,378 | 46,436
Net change in earnings from estimated acquisition earn-out payables: |  |  |  |
Change in fair value on estimated acquisition earn-out payables | 342 | 375 | 334 | 5,228
Interest expense accretion | 714 | 552 | 1,401 | 1,032
Net change in earnings from estimated acquisition earn-out payables | 372 | 177 | 1,735 | 6,260
Ending balance | $ 90,113 | $ 52,696 | $ 90,113 | $ 52,696

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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 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: 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 + Details
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