Organization and Basis of Presentation and Combination - Schedule of Revenue by Major Customer (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Disaggregation of Revenue [Line Items]
Revenues	$ 152,350	$ 123,357	$ 386,642	$ 356,480
U.S. federal government | Office segment revenue
Disaggregation of Revenue [Line Items]
Percentage of revenue	22.60%	30.50%	25.30%	28.50%
U.S. federal government | Total revenue
Disaggregation of Revenue [Line Items]
Percentage of revenue	17.80%	24.30%	20.00%	22.90%
U.S. federal government
Disaggregation of Revenue [Line Items]
Revenues	$ 22,492	$ 27,594	$ 68,869	$ 74,939