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