Schedule IV - Mortgage Loans on Real Estate - Reconciliation of Mortgage Loans (Detail) - USD ($) $ in Thousands |
6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2016 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Movement in Mortgage Loans on Real Estate [Roll Forward] | ||||
| Balance at beginning of period | $ 5,900 | $ 0 | $ 5,900 | $ 5,600 |
| New mortgage loans | 0 | 0 | 0 | 300 |
| Collections of principal | $ (5,900) | 0 | 0 | |
| Balance at end of period | $ 0 | $ 0 | $ 5,900 | |
| X | ||||||||||
- Definition Total carrying amount of mortgage loans as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The amount of principal collected on mortgage loans on real estate during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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| X | ||||||||||
- Definition The cash outflow from the purchase of receivables arising from the mortgage note on real estate. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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