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Fair Value Measurements (Reconciliation of Level 3 Liabilities) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
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 $ 307 $ 597 $ 69 $ (59)
Unobservable Inputs (Level 3) [Member]        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance Liabilities     6,651  
Change in the estimated fair value of the contingent purchase price consideration     69  
Ending Balance Liabilities $ 6,582   $ 6,582