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Consolidated Businesses - Reconciliation of Activity Related to Redeemable Noncontrolling Interest (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2016
Mar. 31, 2015
Reconciliation activity related to the redeemable non controlling interest          
Beginning balance $ 10,506        
Reduction to redeemable noncontrolling interests due to GovDelivery Sale (4,338)        
Ending balance 5,858 $ 10,506      
Payments to acquire additional interest in subsidiaries 5,400 4,000      
Redeemable Noncontrolling Interest          
Reconciliation activity related to the redeemable non controlling interest          
Beginning balance 10,506 10,346 $ 3,442    
Redeemable noncontrolling interest portion of subsidiary net income (778) (393) 72    
FolioDynamix impairment charge   (812)      
Accretion to estimated redemption value 4,937 4,704 6,832    
Equity transfer among owners (4,469) (3,339)      
Ending balance 5,858 10,506 $ 10,346    
GovDelivery          
Reconciliation activity related to the redeemable non controlling interest          
Accretion to value adjustment 1,000 700      
Payments to acquire additional interest in subsidiaries $ 2,500 $ 1,900      
Ownership percentage 94.00% 93.00%   92.00% 91.00%
VelocityEHS          
Reconciliation activity related to the redeemable non controlling interest          
Payments to acquire additional interest in subsidiaries $ 2,400 $ 1,400      
Ownership percentage 99.00% 98.00%   98.00% 96.00%
FolioDynamix          
Reconciliation activity related to the redeemable non controlling interest          
Payments to acquire additional interest in subsidiaries $ 500