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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 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):

 
 
Three Months Ended
 
Nine Months Ended
 
September 30,
September 30,
 
2016
 
2015
 
2016
 
2015
Balance at beginning of period
$
(5,843
)
 
$
(17,326
)
 
$
(20,981
)
 
$
(3,000
)
Additions for acquisitions
—

 
—

 
—

 
(13,814
)
Payments on contingent consideration
5,843

 
—

 
21,594

 
—

Fair value adjustment
—

 
(896
)
 
(613
)
 
(1,408
)
Balance at end of period
$
—

 
$
(18,222
)
 
$
—

 
$
(18,222
)