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Cost Method Businesses - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Schedule of Cost-method Investments [Line Items]        
Carrying value of holdings in cost method companies $ 17,200 $ 17,200   $ 18,100
Impact of subsidiary equity transactions   4,453 $ 268  
Cost-method Investments, Realized Gains 2,800 2,800    
Parchment        
Schedule of Cost-method Investments [Line Items]        
Impact of subsidiary equity transactions 200 700    
InstaMed        
Schedule of Cost-method Investments [Line Items]        
Adjustment to cost method investment $ (1,600)      
Cost-method Investments, Realized Gains   $ 2,800