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Reconciliation of Changes in Fair value of Contingent Consideration (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Fair Value Disclosures [Abstract] |  |  |  |
Fair value, Beginning Balance |  |  |  | $ 4,703
Change in fair value | [1] | $ (1,132) | $ (3,571) |
[1] | We recorded adjustments to the contingent consideration liability in the second and third quarters of 2018, resulting in an increase in income from operations. The income was recorded under “General and Administrative” in the Consolidated Statement of Income. The adjustment was the result of a change in the fair value of the contingent liability, which reflected two year EBITDA targets established prior to the close of the acquisition

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- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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