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Fair Value Measurement - Additional Information (Detail) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total assets measured at fair value $ 133,147,000    
Amount outstanding under the Senior Credit Facility   $ 0 $ 0
Total liabilities measured at fair value 5,516,000 5,756,000  
Cash equivalents [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total assets measured at fair value 133,147,000 3,057,000  
Contingent consideration [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total liabilities measured at fair value   5,756,000  
Level 1 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total assets measured at fair value   3,057,000  
Total liabilities measured at fair value 0 0  
Level 1 [Member] | Cash equivalents [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total assets measured at fair value 133,147,000 3,057,000  
Level 1 [Member] | Contingent consideration [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total liabilities measured at fair value 0 0  
Level 2 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total assets measured at fair value 0 0  
Total liabilities measured at fair value 0 0  
Level 2 [Member] | Cash equivalents [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total assets measured at fair value 0 0  
Level 2 [Member] | Contingent consideration [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total liabilities measured at fair value 0 0  
Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total assets measured at fair value 0 0  
Total liabilities measured at fair value 5,516,000 5,756,000  
Level 3 [Member] | Cash equivalents [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total assets measured at fair value 0 0  
Level 3 [Member] | Contingent consideration [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total liabilities measured at fair value $ 5,516,000 $ 5,756,000