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Related-Party Transactions - Additional Information (Detail)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2013
USD ($)
a
Dec. 31, 2012
USD ($)
a
Dec. 31, 2015
USD ($)
Incentive
$ / shares
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
2022 Note [Member]          
Related Party Transaction [Line Items]          
Debt instrument, interest rate       10.00%  
417 Oakbend, LP [Member]          
Related Party Transaction [Line Items]          
Payments for rent     $ 0.4 $ 0.3 $ 0.3
Registration and legal fees expenses     $ 1.4    
417 Oakbend, LP [Member] | Chief Sales Officer [Member]          
Related Party Transaction [Line Items]          
General partnership ownership interest in related party, percentage     0.01%    
Limited partnership interest in related party, percentage     10.49%    
Kilpatrick Partners, L.L.C [Member]          
Related Party Transaction [Line Items]          
Land purchased | a 18.3 17.6      
Purchase cost of land $ 4.8 $ 2.3      
WCAS Capital Partners IV, L.P., [Member] | 2022 Note [Member]          
Related Party Transaction [Line Items]          
Debt instrument, interest rate     10.00%    
Debt instrument maturity date     Apr. 03, 2022    
Former Employee [Member]          
Related Party Transaction [Line Items]          
Number of incentive units purchased | Incentive     2,605    
Purchase price per incentive unit | $ / shares     $ 260.21    
Incentive units purchased     $ 0.7