| **Investments - Narrative (Details)**                                                                 |                 | 10 Months Ended | 12 Months Ended |
|-------------------------------------------------------------------------------------------------------|-----------------|-----------------|-----------------|
||
| **Schedule of Available-for-sale Securities [Line Items]**                                            |            |            |            |   |   |
| Number of Investment Committee members required to authorize investment | member                      |            |            | 2               |   |   |
| Fair Value                                                                                            |            |            | $ 181,361,000   | $ 198,312,000 |   |
| Realized gains (losses) on sale of securities                                                         |            |            | 795,000         | 5,311,000 | $ (833,000) |
| Proceeds from sales of securities                                                                     |            |            | 197,548,000     | 385,695,000 | 83,239,000 |
| Maturities of securities                                                                              |            |            | 185,000,000     | 410,000,000 |   |
| Gross Unrealized Losses                                                                               |            |            | 1,886,000       | 1,117,000 |   |
| Other-than-temporary impairment losses                                                                |            |            | 0               | 0 | $ 1,295,000 |
| Debt securities, fair value                                                                           |            |            | 139,132,000     |   |   |
| U.S. Treasury securities                                                                              |            |            |            |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |            |            |            |   |   |
| Fair Value                                                                                            |            |            |            | 184,740,000 |   |
| Gross Unrealized Losses                                                                               |            |            |            | 79,000 |   |
| Corporate debt securities                                                                             |            |            |            |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |            |            |            |   |   |
| Fair Value                                                                                            |            |            | 139,132,000     | 6,292,000 |   |
| Gross Unrealized Losses                                                                               |            |            | 1,769,000       | 981,000 |   |
| Debt securities, fair value                                                                           |            |            | 139,100,000     |   |   |
| Preferred stock                                                                                       |            |            |            |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |            |            |            |   |   |
| Fair Value                                                                                            |            |            | 36,593,000      | 208,000 |   |
| Gross Unrealized Losses                                                                               |            |            | 111,000         | $ 57,000 |   |
| Short-term bond                                                                                       |            |            |            |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |            |            |            |   |   |
| Fair Value                                                                                            |            |            | 4,226,000       |   |   |
| Gross Unrealized Losses                                                                               |            |            | 6,000           |   |   |
| Sears Holdings Corp or affiliates | Corporate debt securities                                         |            |            |            |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |            |            |            |   |   |
| Debt securities, fair value                                                                           |            |            | 9,400,000       |   |   |
| Sears Holdings Corp or affiliates | Preferred stock                                                   |            |            |            |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |            |            |            |   |   |
| Other marketable securities, noncurrent                                                               |            |            | $ 200,000       |   |   |
| Corporate debt securities | Maximum                                                                   |            |            |            |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |            |            |            |   |   |
| Investments, target portfolio allocations percent                                                     |            |            | 15.00%          |   |   |
| Cash, investment grade cash equivalents or U.S. treasury securities | Minimum                         |            |            |            |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |            |            |            |   |   |
| Investments, target portfolio allocations percent                                                     | 25.00%          | 50.00%          |            |   |   |
| Other aggregated investments | Minimum | Securities of any one issuer (excluding the U.S. Government) |            |            |            |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |            |            |            |   |   |
| Investments, target portfolio allocations percent                                                     |            |            | 10.00%          |   |   |
| Other aggregated investments | Maximum | Securities of any one issuer (excluding the U.S. Government) |            |            |            |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |            |            |            |   |   |
| Investments, target portfolio allocations percent                                                     |            |            | 15.00%          |   |   |
| Other aggregated investments | Maximum | Single Issuer, Exchange-Traded Common Equities               |            |            |            |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |            |            |            |   |   |
| Investments, target portfolio allocations percent                                                     | 5.00%           |            |            |   |   |
| Common stock investments | Maximum                                                                    |            |            |            |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |            |            |            |   |   |
| Investments, target portfolio allocations, amount                                                     | $ 100,000,000.0 |            |            |   |   |
| Common, preferred or other equity investments | Maximum                                               |            |            |            |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |            |            |            |   |   |
| Investments, target portfolio allocations percent                                                     | 25.00%          |            |            |   |   |
| Investor | Fairholme Capital Management, L.L.C.                                                       |            |            |            |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |            |            |            |   |   |
| Common stock ownership percentage                                                                     |            |            | 32.90%          |   |   |

| X                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of common stock of the reporting entity owned by a third party.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Investments, Target Portfolio Allocations
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Investments, Target Portfolio Allocations, Amount
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| X                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of Investment Committee Members Required to Authorize Investment
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of debt securities categorized neither as held-to-maturity nor trading.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of debt and equity financial instruments classified as other and noncurrent.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which no such other than temporary impairment (OTTI) was previously recognized.
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| - Definition
The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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No definition available.
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