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Schedule of Changes in Level 3 Contingent Consideration Liability Measured on Recurring Basis (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Business Acquisition, Contingent Consideration [Line Items]    
Beginning balance   $ 3,603
Payment   (3,700)
Ending balance $ 3,603  
Level 3    
Business Acquisition, Contingent Consideration [Line Items]    
Beginning balance 3,434 3,603
Accretion 169 97
Payment   $ (3,700)
Ending balance $ 3,603