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Segment Reporting (Schedule of Segments) (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | May 31, 2019 USD ($)
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  | 4 |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | $ 530,949 |  | $ 479,496 |  | $ 798,122 |
Earnings (losses) from equity method investments |  |  |  | 42,126 |  | 41,849 |  | (5,007) |
Selling profit from sales-type leases |  |  |  | 0 |  | 180,416 |  | 0 |
Gain on consolidation of equity method investment |  | $ 67,900 |  | 0 |  | 0 |  | 67,877 |
Income from sales of real estate |  |  | $ 24,500 | 6,318 |  | 236,623 |  | 126,004 |
Total revenue and other earnings |  |  |  | 579,393 |  | 938,384 |  | 986,996 |
Other expense |  |  |  | (569) |  | (13,120) |  | (6,040) |
Allocated interest expense |  |  |  | (169,574) |  | (183,919) |  | (183,751) |
Allocated general and administrative |  |  |  | (61,525) |  | (68,173) |  | (74,572) |
Segment profit (loss) |  |  |  | 97,505 |  | 471,083 |  | 233,163 |
Other significant items: |  |  |  |  |  |  |  |  |
Provision for loan losses |  |  |  | 9,052 |  | 6,482 |  | 16,937 |
Provision for losses on net investment in leases |  |  |  | 1,760 |  | 0 |  | 0 |
Impairment of assets |  |  |  | 7,827 |  | 13,419 |  | 147,108 |
Depreciation and amortization |  |  |  | 58,092 |  | 58,259 |  | 58,699 |
Capitalized expenditures |  |  |  | 53,906 |  | 136,093 |  | 204,722 |
Segment Assets |  |  |  |  |  |  |  |  |
Real estate, net | [1] |  |  | 1,484,281 |  | 1,527,219 |  |  |
Real estate available and held for sale | [1] |  |  | 5,212 |  | 8,650 |  |  |
Total real estate | [1] |  |  | 1,489,493 |  | 1,535,869 |  |  |
Net investment in leases |  |  |  | 429,101 | [1] | 418,915 | [1] |  | $ 424,100
Land and development, net | [1] |  |  | 430,663 |  | 580,545 |  |  |
Loans receivable and other lending investments, net | [1] |  |  | 732,330 |  | 827,861 |  |  |
Other investments | [1] |  |  | 1,176,560 |  | 907,875 |  |  |
Total portfolio assets |  |  |  | 4,258,147 |  | 4,271,065 |  |  |
Cash and other assets |  |  |  | 603,661 |  | 814,044 |  |  |
Total assets | [1] |  |  | 4,861,808 |  | 5,085,109 |  |  |
Stock-based compensation expense |  |  |  | 39,354 |  | 30,436 |  | 17,563 |
Operating lease income |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 188,722 |  | 206,388 |  | 208,192 |
Interest income |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 60,116 |  | 77,654 |  | 97,878 |
Interest income from sales-type leases |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 33,552 |  | 20,496 |  | 0 |
Other income |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 83,857 |  | 55,363 |  | 82,342 |
Land development |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 164,702 |  | 119,595 |  | 409,710 |
Cost of sales expense |  |  |  | (177,727) |  | (109,663) |  | (350,181) |
Real estate expense |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Cost of sales expense |  |  |  | (72,493) |  | (92,426) |  | (139,289) |
Operating Segments | Net Lease |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Earnings (losses) from equity method investments |  |  |  | 56,130 |  | 29,235 |  | 8,479 |
Selling profit from sales-type leases |  |  |  |  |  | 180,416 |  |  |
Gain on consolidation of equity method investment |  |  |  |  |  |  |  | 67,877 |
Income from sales of real estate |  |  |  | 6,056 |  | 224,654 |  | 45,038 |
Total revenue and other earnings |  |  |  | 284,446 |  | 651,216 |  | 277,638 |
Other expense |  |  |  | 0 |  | 0 |  | 0 |
Allocated interest expense |  |  |  | (101,208) |  | (95,154) |  | (63,706) |
Allocated general and administrative |  |  |  | (23,223) |  | (25,990) |  | (20,713) |
Segment profit (loss) |  |  |  | 133,444 |  | 505,286 |  | 176,186 |
Other significant items: |  |  |  |  |  |  |  |  |
Provision for loan losses |  |  |  | 186 |  | 0 |  | 0 |
Provision for losses on net investment in leases |  |  |  | 1,760 |  |  |  |  |
Impairment of assets |  |  |  | 2,037 |  | 2,471 |  | 10,391 |
Depreciation and amortization |  |  |  | 50,767 |  | 51,091 |  | 38,588 |
Capitalized expenditures |  |  |  | 21,764 |  | 31,445 |  | 40,215 |
Segment Assets |  |  |  |  |  |  |  |  |
Real estate, net |  |  |  | 1,291,903 |  | 1,327,082 |  |  |
Real estate available and held for sale |  |  |  | 0 |  | 0 |  |  |
Total real estate |  |  |  | 1,291,903 |  | 1,327,082 |  |  |
Net investment in leases |  |  |  | 429,101 |  | 418,915 |  |  |
Land and development, net |  |  |  | 0 |  | 0 |  |  |
Loans receivable and other lending investments, net |  |  |  | 45,398 |  | 44,339 |  |  |
Other investments |  |  |  | 1,016,710 |  | 760,068 |  |  |
Total portfolio assets |  |  |  | 2,783,112 |  | 2,550,404 |  |  |
Operating Segments | Net Lease | Operating lease income |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 167,152 |  | 177,679 |  | 151,958 |
Operating Segments | Net Lease | Interest income |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 3,440 |  | 2,018 |  | 0 |
Operating Segments | Net Lease | Interest income from sales-type leases |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 33,552 |  | 20,496 |  |  |
Operating Segments | Net Lease | Other income |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 18,116 |  | 16,718 |  | 4,286 |
Operating Segments | Net Lease | Land development |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 0 |  | 0 |  | 0 |
Cost of sales expense |  |  |  | 0 |  | 0 |  | 0 |
Operating Segments | Net Lease | Real estate expense |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Cost of sales expense |  |  |  | (26,571) |  | (24,786) |  | (17,033) |
Operating Segments | Real Estate Finance |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Earnings (losses) from equity method investments |  |  |  | 0 |  | 0 |  | 0 |
Selling profit from sales-type leases |  |  |  |  |  | 0 |  |  |
Gain on consolidation of equity method investment |  |  |  |  |  |  |  | 0 |
Income from sales of real estate |  |  |  | 0 |  | 0 |  | 0 |
Total revenue and other earnings |  |  |  | 68,651 |  | 80,582 |  | 102,434 |
Other expense |  |  |  | (266) |  | (462) |  | (1,578) |
Allocated interest expense |  |  |  | (23,390) |  | (29,587) |  | (40,653) |
Allocated general and administrative |  |  |  | (6,622) |  | (8,254) |  | (12,997) |
Segment profit (loss) |  |  |  | 38,373 |  | 42,279 |  | 47,206 |
Other significant items: |  |  |  |  |  |  |  |  |
Provision for loan losses |  |  |  | 8,866 |  | 6,482 |  | 16,937 |
Provision for losses on net investment in leases |  |  |  | 0 |  |  |  |  |
Impairment of assets |  |  |  | 0 |  | 0 |  | 0 |
Depreciation and amortization |  |  |  | 0 |  | 0 |  | 0 |
Capitalized expenditures |  |  |  | 0 |  | 0 |  | 0 |
Segment Assets |  |  |  |  |  |  |  |  |
Real estate, net |  |  |  | 0 |  | 0 |  |  |
Real estate available and held for sale |  |  |  | 0 |  | 0 |  |  |
Total real estate |  |  |  | 0 |  | 0 |  |  |
Net investment in leases |  |  |  | 0 |  | 0 |  |  |
Land and development, net |  |  |  | 0 |  | 0 |  |  |
Loans receivable and other lending investments, net |  |  |  | 686,932 |  | 783,522 |  |  |
Other investments |  |  |  | 0 |  | 0 |  |  |
Total portfolio assets |  |  |  | 686,932 |  | 783,522 |  |  |
Operating Segments | Real Estate Finance | Operating lease income |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 0 |  | 0 |  | 0 |
Operating Segments | Real Estate Finance | Interest income |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 56,676 |  | 75,636 |  | 97,878 |
Operating Segments | Real Estate Finance | Interest income from sales-type leases |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 0 |  | 0 |  |  |
Operating Segments | Real Estate Finance | Other income |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 11,975 |  | 4,946 |  | 4,556 |
Operating Segments | Real Estate Finance | Land development |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 0 |  | 0 |  | 0 |
Cost of sales expense |  |  |  | 0 |  | 0 |  | 0 |
Operating Segments | Real Estate Finance | Real estate expense |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Cost of sales expense |  |  |  | 0 |  | 0 |  | 0 |
Operating Segments | Operating Properties |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Earnings (losses) from equity method investments |  |  |  | (16,361) |  | 8,298 |  | (1,003) |
Selling profit from sales-type leases |  |  |  |  |  | 0 |  |  |
Gain on consolidation of equity method investment |  |  |  |  |  |  |  | 0 |
Income from sales of real estate |  |  |  | 262 |  | 11,969 |  | 80,966 |
Total revenue and other earnings |  |  |  | 13,180 |  | 66,074 |  | 190,001 |
Other expense |  |  |  | 0 |  | 0 |  | 0 |
Allocated interest expense |  |  |  | (8,951) |  | (10,249) |  | (18,618) |
Allocated general and administrative |  |  |  | (2,591) |  | (2,887) |  | (6,574) |
Segment profit (loss) |  |  |  | (21,298) |  | 17,616 |  | 84,239 |
Other significant items: |  |  |  |  |  |  |  |  |
Provision for loan losses |  |  |  | 0 |  | 0 |  | 0 |
Provision for losses on net investment in leases |  |  |  | 0 |  |  |  |  |
Impairment of assets |  |  |  | 3,052 |  | 3,853 |  | 79,991 |
Depreciation and amortization |  |  |  | 5,142 |  | 4,977 |  | 17,417 |
Capitalized expenditures |  |  |  | 1,636 |  | 5,617 |  | 19,912 |
Segment Assets |  |  |  |  |  |  |  |  |
Real estate, net |  |  |  | 192,378 |  | 200,137 |  |  |
Real estate available and held for sale |  |  |  | 5,212 |  | 8,650 |  |  |
Total real estate |  |  |  | 197,590 |  | 208,787 |  |  |
Net investment in leases |  |  |  | 0 |  | 0 |  |  |
Land and development, net |  |  |  | 0 |  | 0 |  |  |
Loans receivable and other lending investments, net |  |  |  | 0 |  | 0 |  |  |
Other investments |  |  |  | 58,739 |  | 61,686 |  |  |
Total portfolio assets |  |  |  | 256,329 |  | 270,473 |  |  |
Operating Segments | Operating Properties | Operating lease income |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 21,214 |  | 28,423 |  | 55,677 |
Operating Segments | Operating Properties | Interest income |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 0 |  | 0 |  | 0 |
Operating Segments | Operating Properties | Interest income from sales-type leases |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 0 |  | 0 |  |  |
Operating Segments | Operating Properties | Other income |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 8,065 |  | 17,384 |  | 54,361 |
Operating Segments | Operating Properties | Land development |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 0 |  | 0 |  | 0 |
Cost of sales expense |  |  |  | 0 |  | 0 |  | 0 |
Operating Segments | Operating Properties | Real estate expense |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Cost of sales expense |  |  |  | (22,936) |  | (35,322) |  | (80,570) |
Operating Segments | Land and Development |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Earnings (losses) from equity method investments |  |  |  | 3,432 |  | 4,322 |  | (3,110) |
Selling profit from sales-type leases |  |  |  |  |  | 0 |  |  |
Gain on consolidation of equity method investment |  |  |  |  |  |  |  | 0 |
Income from sales of real estate |  |  |  | 0 |  | 0 |  | 0 |
Total revenue and other earnings |  |  |  | 187,520 |  | 132,041 |  | 414,477 |
Other expense |  |  |  | 0 |  | 0 |  | 0 |
Allocated interest expense |  |  |  | (17,940) |  | (20,706) |  | (21,897) |
Allocated general and administrative |  |  |  | (9,990) |  | (11,957) |  | (14,313) |
Segment profit (loss) |  |  |  | (41,123) |  | (42,603) |  | (13,600) |
Other significant items: |  |  |  |  |  |  |  |  |
Provision for loan losses |  |  |  | 0 |  | 0 |  | 0 |
Provision for losses on net investment in leases |  |  |  | 0 |  |  |  |  |
Impairment of assets |  |  |  | 2,738 |  | 6,427 |  | 56,726 |
Depreciation and amortization |  |  |  | 952 |  | 977 |  | 1,353 |
Capitalized expenditures |  |  |  | 30,506 |  | 99,031 |  | 144,595 |
Segment Assets |  |  |  |  |  |  |  |  |
Real estate, net |  |  |  | 0 |  | 0 |  |  |
Real estate available and held for sale |  |  |  | 0 |  | 0 |  |  |
Total real estate |  |  |  | 0 |  | 0 |  |  |
Net investment in leases |  |  |  | 0 |  | 0 |  |  |
Land and development, net |  |  |  | 430,663 |  | 580,545 |  |  |
Loans receivable and other lending investments, net |  |  |  | 0 |  | 0 |  |  |
Other investments |  |  |  | 31,200 |  | 42,866 |  |  |
Total portfolio assets |  |  |  | 461,863 |  | 623,411 |  |  |
Operating Segments | Land and Development | Operating lease income |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 356 |  | 286 |  | 557 |
Operating Segments | Land and Development | Interest income |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 0 |  | 0 |  | 0 |
Operating Segments | Land and Development | Interest income from sales-type leases |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 0 |  | 0 |  |  |
Operating Segments | Land and Development | Other income |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 19,030 |  | 7,838 |  | 7,320 |
Operating Segments | Land and Development | Land development |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 164,702 |  | 119,595 |  | 409,710 |
Cost of sales expense |  |  |  | (177,727) |  | (109,663) |  | (350,181) |
Operating Segments | Land and Development | Real estate expense |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Cost of sales expense |  |  |  | (22,986) |  | (32,318) |  | (41,686) |
Corporate/Other |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Earnings (losses) from equity method investments |  |  |  | (1,075) |  | (6) |  | (9,373) |
Selling profit from sales-type leases |  |  |  |  |  | 0 |  |  |
Gain on consolidation of equity method investment |  |  |  |  |  |  |  | 0 |
Income from sales of real estate |  |  |  | 0 |  | 0 |  | 0 |
Total revenue and other earnings |  |  |  | 25,596 |  | 8,471 |  | 2,446 |
Other expense |  |  |  | (303) |  | (12,658) |  | (4,462) |
Allocated interest expense |  |  |  | (18,085) |  | (28,223) |  | (38,877) |
Allocated general and administrative |  |  |  | (19,099) |  | (19,085) |  | (19,975) |
Segment profit (loss) |  |  |  | (11,891) |  | (51,495) |  | (60,868) |
Other significant items: |  |  |  |  |  |  |  |  |
Provision for loan losses |  |  |  | 0 |  | 0 |  | 0 |
Provision for losses on net investment in leases |  |  |  | 0 |  |  |  |  |
Impairment of assets |  |  |  | 0 |  | 668 |  | 0 |
Depreciation and amortization |  |  |  | 1,231 |  | 1,214 |  | 1,341 |
Capitalized expenditures |  |  |  | 0 |  | 0 |  | 0 |
Segment Assets |  |  |  |  |  |  |  |  |
Real estate, net |  |  |  | 0 |  | 0 |  |  |
Real estate available and held for sale |  |  |  | 0 |  | 0 |  |  |
Total real estate |  |  |  | 0 |  | 0 |  |  |
Net investment in leases |  |  |  | 0 |  | 0 |  |  |
Land and development, net |  |  |  | 0 |  | 0 |  |  |
Loans receivable and other lending investments, net |  |  |  | 0 |  | 0 |  |  |
Other investments |  |  |  | 69,911 |  | 43,255 |  |  |
Total portfolio assets |  |  |  | 69,911 |  | 43,255 |  |  |
Corporate/Other | Operating lease income |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 0 |  | 0 |  | 0 |
Corporate/Other | Interest income |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 0 |  | 0 |  | 0 |
Corporate/Other | Interest income from sales-type leases |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 0 |  | 0 |  |  |
Corporate/Other | Other income |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 26,671 |  | 8,477 |  | 11,819 |
Corporate/Other | Land development |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 0 |  | 0 |  | 0 |
Cost of sales expense |  |  |  | 0 |  | 0 |  | 0 |
Corporate/Other | Real estate expense |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |
Cost of sales expense |  |  |  | $ 0 |  | $ 0 |  | $ 0 |
[1] | Refer to Note 2 for details on the Company's consolidated variable interest entities ("VIEs").

X
- Definition Sum of all assets excluding the Company's Total Portfolio Assets. + References No definition available. + Details
Name: | star_CashAndOtherAssets
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The aggregate total of expenses of managing and administering the affairs of the entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line, excluding stock-based compensation expense. + References No definition available. + Details
Name: | star_GeneralAndAdministrativeExpenseExcludingStockBasedCompensationExpense
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics. In addition, amount also includes total debt and equity financial instruments including: securities held-to-maturity and securities available-for-sale. + References No definition available. + Details
Name: | star_LoansAndOtherLendingInvestments
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The aggregate of Total real estate, loans receivable, net and Other investments. + References No definition available. + Details
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- Definition The gain (loss) recognized on initial consolidation of a variable interest entity (VIE) when the VIE is not a business (as defined). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5710-111685 + Details
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