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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Schedule of Reconciliations of Liabilities Measured and Carried at Fair Value on Recurring Basis, with Significant Unobservable Inputs
The following table summarizes the changes in the balance of contingent consideration for the year ended December 31, 2016 (in thousands):

Balance at beginning of year
 
$
(20,981
)
Additions for acquisitions
 
—

Payments on contingent consideration
 
21,594

Fair value adjustments
 
(613
)
Balance at end of year
 
$
—