Related-Party Transactions - Additional Information (Detail) - 417 Oakbend, LP [Member] - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Apr. 30, 2016
Related Party Transaction [Line Items]
Payments for rent	$ 0.1	$ 0.2
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%