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Related-Party Transactions - Additional Information (Detail) - 417 Oakbend, LP [Member] - USD ($)
$ in Millions
4 Months Ended 12 Months Ended
Apr. 30, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]    
Payments for rent $ 0.1 $ 0.4
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%