Real Estate Fund Investments - Schedule of Financial Information for Fund Investment (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Property Fund II [Member]
Investment Holdings [Line Items]
Real estate funds financial	$ 66,413
Real estate funds financial	60
Real estate funds financial	66,353
Real estate funds financial	66,413
Property Fund III [Member]
Investment Holdings [Line Items]
Real estate funds financial	41,597
Real estate funds financial	49
Real estate funds financial	41,548
Real estate funds financial	41,597
Property Fund VII [Member]
Investment Holdings [Line Items]
Real estate funds financial	166,297
Real estate funds financial	1,483
Real estate funds financial	164,814
Real estate funds financial	166,297
Real Estate Investments [Member] | Property Fund II [Member]
Investment Holdings [Line Items]
Real estate funds financial	64,989
Real Estate Investments [Member] | Property Fund III [Member]
Investment Holdings [Line Items]
Real estate funds financial	39,376
Real Estate Investments [Member] | Property Fund VII [Member]
Investment Holdings [Line Items]
Real estate funds financial	165,556
Cash And Cash Equivalent [Member] | Property Fund II [Member]
Investment Holdings [Line Items]
Real estate funds financial	1,297
Cash And Cash Equivalent [Member] | Property Fund III [Member]
Investment Holdings [Line Items]
Real estate funds financial	2,221
Cash And Cash Equivalent [Member] | Property Fund VII [Member]
Investment Holdings [Line Items]
Real estate funds financial	741
Other Assets [Member] | Property Fund II [Member]
Investment Holdings [Line Items]
Real estate funds financial	127
Other Liabilities [Member] | Property Fund II [Member]
Investment Holdings [Line Items]
Real estate funds financial	60
Other Liabilities [Member] | Property Fund III [Member]
Investment Holdings [Line Items]
Real estate funds financial	49
Other Liabilities [Member] | Property Fund VII [Member]
Investment Holdings [Line Items]
Real estate funds financial	$ 1,483