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Goodwill, Deferred Leasing Costs and Other Intangibles - Goodwill, Intangible Assets and Liabilities Acquired (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred Leasing Costs and Intangible Assets            
Deferred leasing and other intangible assets, carrying amount     $ 1,110,851 $ 857,266 $ 1,110,851  
Deferred leasing and other intangible assets, accumulated amortization     (257,979) (317,002) (257,979)  
Deferred leasing and other intangible assets, net carrying amount     852,872 540,264 852,872  
Intangible Liabilities            
Below-market lease values, carrying amount     214,833 204,066 214,833  
Below-market lease values, accumulated amortization     (36,426) (59,180) (36,426)  
Below-market lease values     178,407 144,886 178,407  
Above-market ground lease obligations, carrying amount     13,417 16,080 13,417  
Above-market ground lease obligations, accumulated amortization     (715) (1,580) (715)  
Above-market ground lease obligations     12,702 14,500 12,702  
Intangible liabilities, carrying amount     228,250 220,146 228,250  
Intangible liabilities, accumulated amortization     (37,141) (60,760) (37,141)  
Total intangible liabilities     191,109 159,386 191,109  
Impairment loss       588,223 104,360 $ 11,717
Impairment loss       588,223 420,360 11,717
In-place lease values            
Deferred Leasing Costs and Intangible Assets            
Deferred leasing and other intangible assets, carrying amount     243,037 267,221 243,037  
Deferred leasing and other intangible assets, accumulated amortization     (98,021) (112,673) (98,021)  
Deferred leasing and other intangible assets, net carrying amount     145,016 154,548 145,016  
Above-market lease values            
Deferred Leasing Costs and Intangible Assets            
Deferred leasing and other intangible assets, carrying amount     166,571 129,079 166,571  
Deferred leasing and other intangible assets, accumulated amortization     (34,968) (43,412) (34,968)  
Deferred leasing and other intangible assets, net carrying amount     131,603 85,667 131,603  
Below-market ground lease obligations            
Deferred Leasing Costs and Intangible Assets            
Deferred leasing and other intangible assets, carrying amount     29,625 16,258 29,625  
Deferred leasing and other intangible assets, accumulated amortization     (316) (984) (316)  
Deferred leasing and other intangible assets, net carrying amount     29,309 15,274 29,309  
Deferred leasing costs            
Deferred Leasing Costs and Intangible Assets            
Deferred leasing and other intangible assets, carrying amount     121,765 111,486 121,765  
Deferred leasing and other intangible assets, accumulated amortization     (38,389) (46,666) (38,389)  
Deferred leasing and other intangible assets, net carrying amount     83,376 64,820 83,376  
Lease incentives            
Deferred Leasing Costs and Intangible Assets            
Deferred leasing and other intangible assets, carrying amount     14,565 14,576 14,565  
Deferred leasing and other intangible assets, accumulated amortization     (298) (1,381) (298)  
Deferred leasing and other intangible assets, net carrying amount     14,267 13,195 14,267  
Trade name            
Deferred Leasing Costs and Intangible Assets            
Deferred leasing and other intangible assets, carrying amount     79,700 15,500 79,700  
Deferred leasing and other intangible assets, accumulated amortization     (3,131) 0 (3,131)  
Deferred leasing and other intangible assets, net carrying amount     76,569 $ 15,500 76,569  
Intangible Liabilities            
Useful life of finite-lived intangible assets       20 years    
Impairment loss       $ 59,464 0 0
Investment management contracts            
Deferred Leasing Costs and Intangible Assets            
Deferred leasing and other intangible assets, carrying amount     342,127 194,698 342,127  
Deferred leasing and other intangible assets, accumulated amortization     (70,394) (92,618) (70,394)  
Deferred leasing and other intangible assets, net carrying amount     271,733 102,080 271,733  
Intangible Liabilities            
Impairment loss       147,429 59,073 320
Customer relationships            
Deferred Leasing Costs and Intangible Assets            
Deferred leasing and other intangible assets, carrying amount     59,400 49,291 59,400  
Deferred leasing and other intangible assets, accumulated amortization     (10,421) (15,027) (10,421)  
Deferred leasing and other intangible assets, net carrying amount     48,979 34,264 48,979  
Intangible Liabilities            
Impairment loss       10,109 0 $ 0
Other            
Deferred Leasing Costs and Intangible Assets            
Deferred leasing and other intangible assets, carrying amount     54,061 59,157 54,061  
Deferred leasing and other intangible assets, accumulated amortization     (2,041) (4,241) (2,041)  
Deferred leasing and other intangible assets, net carrying amount     52,020 $ 54,916 $ 52,020  
NorthStar I And NorthStar II | Investment management contracts            
Intangible Liabilities            
Write-off of intangible assets   $ 139,000        
NorthStar RXR NY Metro | Investment management contracts            
Intangible Liabilities            
Write-off of intangible assets $ 7,000 $ 1,400        
Estimated future cash flows, discount rate 10.00%          
Investment management contracts | Nonrecurring | NorthStar RXR NY Metro            
Intangible Liabilities            
Impairment loss     $ 3,700      
Investment management contracts | Nonrecurring | NorthStar RXR NY Metro | Discount rate            
Intangible Liabilities            
Discount rate     9.00%      
Investment management contracts | Nonrecurring | NorthStar Healthcare            
Intangible Liabilities            
Impairment loss     $ 55,300