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Fair Value Measurements (Reconciliation of Level 3 Liabilities) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Change in the estimated fair value of the contingent purchase price consideration $ (5,497) $ (83) $ (5,327) $ 238
Unobservable Inputs (Level 3) [Member]        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance Liabilities     6,142  
Change in the estimated fair value of the contingent purchase price consideration     5,327  
Ending Balance Liabilities $ 815   $ 815