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Investments in Affiliates and Other Entities - Equity Investments by Type (Details) - USD ($) | Dec. 31, 2022 | Sep. 30, 2023
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Marketable equity securities (1) | $ 0 | $ 0
Non-marketable equity securities | 54,134,000 | 53,246,000
Total equity investments | 211,218,000 | 176,655,000
Integral Affiliates |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | 101,251,000 | 94,927,000
Non-Integral Unconsolidated Affiliates |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | 55,833,000 | $ 28,482,000
Starry Group Holdings, Inc. |  |
Schedule of Equity Method Investments [Line Items] |  |
Marketable equity securities (1) | 0 |
Unrealized loss on investment | $ 91,500,000 |

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