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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Business Combinations [Abstract] |  |  |  |
Document Period End Date |  |  | Jun. 30, 2019 |
Beginning balance | $ 108,710 | $ 40,600 | $ 89,924 | $ 36,175
Additions to estimated acquisition earn-out payables | 5,811 | 17,549 | 23,966 | 22,071
Payments for estimated acquisition earn-out payables | (6,685) | (6,028) | (7,264) | (8,591)
Subtotal | 107,836 | 52,121 | 106,626 | 49,655
Net change in earnings from estimated acquisition earn-out payables: |  |  |  |
Change in fair value on estimated acquisition earn-out payables | (4,350) | (189) | (4,301) | 1,873
Interest expense accretion | 1,490 | 608 | 2,651 | 1,012
Net change in earnings from estimated acquisition earn-out payables | (2,860) | 419 | (1,650) | 2,885
Ending balance | $ 104,976 | $ 52,540 | $ 104,976 | $ 52,540

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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