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Business Acquisitions - Summary of Consideration Transferred (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jun. 26, 2015
Mar. 03, 2015
Dec. 31, 2015
Business Acquisition [Line Items]      
Cash     $ 626
Health at Work Wellness Actuaries LLC [Member]      
Business Acquisition [Line Items]      
Common stock   $ 1,551  
Cash   1  
Fair value of consideration transferred   $ 1,552  
White Sky, Inc. [Member]      
Business Acquisition [Line Items]      
Common stock $ 576    
Cash 796    
Fair value of consideration transferred 1,372    
Fair value of previously held equity interest in White Sky 1,029   $ 1,000
Fair value of final purchase price transferred including previously held equity interest $ 2,401