Fair Value Measurements - Schedule of Assets at Fair Value on Nonrecurring Basis (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment of other assets $ 0 $ (3)  
Total impairment charges (34,376) $ (12,618)  
Fair Value, Measurements, Nonrecurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets held and used 29,796   $ 44,698
Lease intangible assets 350   6,384
Other assets     27
Long-lived assets held for sale 22,077   24,493
Long-lived assets held and used, dispositions 0   (5,515)
Lease intangible assets, dispositions 0   0
Other assets, dispositions     0
Long-lived assets held for sale, dispositions 0   (36,907)
Impairment of long-lived assets held and used (23,173)   (53,514)
Impairment of intangible assets 322   (9,116)
Impairment of other assets     (198)
Impairment of long-lived assets held for sale (11,525)   (25,447)
Total impairment charges (34,376)   (88,275)
Fair Value, Measurements, Nonrecurring | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets held and used 0   0
Lease intangible assets 0   0
Other assets     0
Long-lived assets held for sale 0   0
Fair Value, Measurements, Nonrecurring | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets held and used 0   0
Lease intangible assets 0   0
Other assets     0
Long-lived assets held for sale 0   0
Fair Value, Measurements, Nonrecurring | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets held and used 29,796   50,213
Lease intangible assets 350   6,384
Other assets     27
Long-lived assets held for sale 22,077   61,400
Retail | Fair Value, Measurements, Nonrecurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets held and used 19,281   33,766
Long-lived assets held and used, dispositions 0   (4,168)
Impairment of long-lived assets held and used (18,506)   (37,445)
Retail | Fair Value, Measurements, Nonrecurring | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets held and used 0   0
Retail | Fair Value, Measurements, Nonrecurring | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets held and used 0   0
Retail | Fair Value, Measurements, Nonrecurring | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets held and used 19,281   37,934
Industrial | Fair Value, Measurements, Nonrecurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets held and used 3,725   2,394
Long-lived assets held and used, dispositions 0   (1,347)
Impairment of long-lived assets held and used (3,293)   (5,948)
Industrial | Fair Value, Measurements, Nonrecurring | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets held and used 0   0
Industrial | Fair Value, Measurements, Nonrecurring | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets held and used 0   0
Industrial | Fair Value, Measurements, Nonrecurring | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets held and used 3,725   3,741
Office | Fair Value, Measurements, Nonrecurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets held and used 6,790   8,538
Long-lived assets held and used, dispositions 0   0
Impairment of long-lived assets held and used (1,374)   (10,121)
Office | Fair Value, Measurements, Nonrecurring | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets held and used 0   0
Office | Fair Value, Measurements, Nonrecurring | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets held and used 0   0
Office | Fair Value, Measurements, Nonrecurring | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets held and used $ 6,790   $ 8,538