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Partially-Owned Leasing Subsidiaries - Narrative (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) board_member subsidiary | Dec. 31, 2018
Noncontrolling Interest [Line Items] |  |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage |  | 5.00%
Partially-owned subsidiaries |  |
Noncontrolling Interest [Line Items] |  |
Trinity guarantees of subsidiary-related activities | $ | $ 0 |
Railcar Leasing and Management Services Group | Partially-owned subsidiaries |  |
Noncontrolling Interest [Line Items] |  |
Number of subsidiaries | subsidiary | 2 |
Number of board members | board_member | 7 |
Number of TILC designated board members | board_member | 2 |
Partially-owned subsidiaries | Railcar Leasing and Management Services Group |  |
Noncontrolling Interest [Line Items] |  |
Carrying value of investment in partially-owned subsidiaries | $ | $ 188,600,000 |
Weighted average ownership | 38.00% |
Weighted average ownership interest by institutional investors | 62.00% |

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