Summary of Significant Accounting Policies - Additional Details of Adjustments to Financial Statements (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other assets	$ 15,363	$ 16,778
Mortgages and other notes payable	$ 146,251	184,341
ASU 2015-03
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other assets		16,778
Mortgages and other notes payable		184,341
As Reported | ASU 2015-03
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other assets		18,176
Mortgages and other notes payable		185,739
Adjustments | ASU 2015-03
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other assets		(1,398)
Mortgages and other notes payable		$ (1,398)