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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.