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Acquisition of Our Former Manager's Agency Platform (Details) $ / shares in Units, $ in Millions	May 31, 2017 USD ($) employee segment	Jul. 14, 2016 USD ($) $ / shares shares
Acquisition of Our Former Manager's Agency Platform
Number of reporting segments | segment	2
ACM Acquisition
Acquisition of Our Former Manager's Agency Platform
Total consideration		$ 292.5
Acquisition share price per common share based on closing price on the day of the ACM Acquisition | $ / shares		$ 7.29
Termination of existing management agreement | ACM Acquisition
Acquisition of Our Former Manager's Agency Platform
Number of employees to manage/advise our business | employee	100
Option to terminate the existing management agreement and purchase the services provided by Former Manager's employees		$ 25.0
Price of fully internalize our management team and terminate the existing management agreement assigned to goodwill	$ 25.0
Termination of existing management agreement | ACM Acquisition | Structured Business
Acquisition of Our Former Manager's Agency Platform
Goodwill	12.5
Termination of existing management agreement | ACM Acquisition | Agency Business
Acquisition of Our Former Manager's Agency Platform
Goodwill	12.5
Termination of existing management agreement | ACM Acquisition | Maximum
Acquisition of Our Former Manager's Agency Platform
Expenses incurred to fully internalize management team	$ 0.1
Operating Partnership | ACM Acquisition
Acquisition of Our Former Manager's Agency Platform
Total consideration		275.8
Purchase price paid in stock		138.0
Purchase price paid in cash		87.8
Borrowings from seller financing - related party		$ 50.0
OP units issued as part of acquisition | shares		21,230,769
Acquisition share price per common share based on closing price on the day of the ACM Acquisition | $ / shares		$ 6.50

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