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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2016
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 balance of the contingent consideration and changes for the periods presented (in thousands):

 
 
Year Ended December 31,
 
 
2016
 
2015
Balance at beginning of year
 
$
(20,981
)
 
$
(3,000
)
Additions for acquisitions
 
—

 
(13,814
)
Payments on contingent consideration
 
21,594

 
—

Fair value adjustments
 
(613
)
 
(4,167
)
Balance at end of year
 
$
—

 
$
(20,981
)