Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Commitments and Contingencies
Line of credit, performance and payment bonds	$ 29.5	$ 34.8
Operating Partnership
Commitments and Contingencies
Credit facility, amount outstanding	2.4	$ 2.1
1405 Point | Financial Guarantee | Operating Partnership
Commitments and Contingencies
Credit facility, amount outstanding	$ 2.1