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Equity-Based Compensation - Consolidated Businesses (Detail) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Nov. 30, 2015
Sep. 30, 2016
Stock Options    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock awards vesting period   4 years
Stock Options | First anniversary of grant date    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Vesting percentage   25.00%
Stock Options | Vested ratably each month over the subsequent 36 months    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock awards vesting period   36 months
Vesting percentage   75.00%
Stock Options | Vested on each Anniversary    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Vesting percentage   25.00%
NuCivic | GovDelivery | Restricted stock    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock options granted in the period, fair value   $ 3.1
Textizen | GovDelivery    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock awards vesting period   4 years
Textizen | GovDelivery | Restricted stock    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock options granted in the period, fair value   $ 0.9
FolioDynamix | Stock Options    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock options granted in the period, fair value   $ 5.1
FolioDynamix | Stock Options | Vested in November 2015    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Vesting percentage 25.00%  
FolioDynamix | Stock Options | Vested in equal increments from December 2016 through June 2018    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Vesting percentage   75.00%