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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2013
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis
The assets and liabilities measured at fair value on a recurring basis are as follows (in thousands):
 
As of June 30, 2013
 
Fair Value Measurements Using
 
Total
 
Quoted Prices in Active Markets for Identical Assets
 
Significant Other Observable Inputs
 
Significant Unobservable Inputs
 
 
 
(Level 1)
 
(Level 2)
 
(Level 3)
 
 
Contingent consideration to be paid in cash for the acquisitions
$
—

 
$
—

 
$
(3,171
)
 
$
(3,171
)
 
 
 
 
 
 
 
 
 
As of December 31, 2012
 
Fair Value Measurements Using
 
Total
 
Quoted Prices in Active Markets for Identical Assets
 
Significant Other Observable Inputs
 
Significant Unobservable Inputs
 
 
(Level 1)
 
(Level 2)
 
(Level 3)
 
 
Contingent consideration to be paid in cash for the acquisitions
$
—

 
$
—

 
$
(7,577
)
 
$
(7,577
)
Schedule of Reconciliations of Liabilities Measured and Carried at Fair Value on Recurring Basis, with Significant Unobservable Inputs
Reconciliations of liabilities measured and carried at fair value on a recurring basis with the use of significant unobservable inputs (Level 3) are as follows (in thousands):
 
 
Three Months Ended
 
Six Months Ended
 
June 30,
June 30,
 
2013
 
2012
 
2013
 
2012
Contingent consideration for acquisitions
 
 
 
 
 
 
 
Balance at beginning of period
$
(6,544
)
 
$
(10,091
)
 
$
(7,577
)
 
$
(9,856
)
Payments on contingent consideration
3,425

 
—

 
3,425

 
—

Fair value adjustment
62

 
402

 
892

 
370

Foreign currency translation adjustment
(114
)
 
372

 
89

 
169

Balance at end of period
$
(3,171
)
 
$
(9,317
)
 
$
(3,171
)
 
$
(9,317
)