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Equity-Based Compensation - Restricted Stock Awards with Performance Conditions Additional Information (Detail)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2015
shares
Jan. 31, 2014
employee
shares
Sep. 30, 2016
USD ($)
shares
Jun. 30, 2016
shares
Mar. 31, 2016
shares
Sep. 30, 2015
USD ($)
shares
Jun. 30, 2015
shares
Mar. 31, 2015
shares
Sep. 30, 2016
USD ($)
shares
Sep. 30, 2015
USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Unrecognized equity-based compensation | $     $ 18,456     $ 34,107     $ 18,456 $ 34,107
Restricted stock                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Number of shares, granted (in shares)       112,397 434,283   140,416 441,256    
Number of shares, vested (in shares)     16,201 81,391 657,317 28,461 63,017 644,247    
Number of shares, forfeited (in shares)       7,500 588,819 26,125   43,660    
Performance metrics of GovDelivery | Restricted stock                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Number of shares, granted (in shares)   244,506                
Number of employees granted shares in period | employee   2                
Number of shares, vested (in shares)         81,322     56,587    
Number of shares, forfeited (in shares)         62,937     43,660    
Performance metrics of GovDelivery | Restricted stock | Vesting in first quarter of 2015                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Number of shares, granted (in shares)   100,247                
Performance metrics of GovDelivery | Restricted stock | Vesting in first quarter of 2016                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Number of shares, granted (in shares)   144,259                
Performance based plan | Restricted stock | Executives                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Number of shares, granted (in shares) 42,341                  
Number of shares, vested (in shares)         28,341          
Number of shares, forfeited (in shares)         14,000          
2016 Performance Plan | Restricted stock                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Number of shares, granted (in shares)                 419,283  
Share based compensation expense | $     $ 200     $ 800     $ 2,100 $ 3,600
Unrecognized equity-based compensation | $     $ 900           $ 900