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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 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):

 
 
Three Months Ended
 
March 31,
 
2016
 
2015
Balance at beginning of period
$
(20,981
)
 
$
(3,000
)
Additions for acquisitions
—

 
—

Payments on contingent consideration
—

 
—

Fair value adjustment
(613
)
 
—

Foreign currency translation adjustment
—

 
—

Balance at end of period
$
(21,594
)
 
$
(3,000
)