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Changes in Mortgage Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Mortgage Loans On Real Estate [Abstract] |  |  |
Balance at beginning of period | $ 297,451 | $ 442,826 | $ 437,144
Additions during period: |  |  |
New mortgage loans | 0 | 0 | 11,139
Interest | 20,807 | 28,116 | 36,499
Accretion of discount | 0 | 269 | 1,038
Deductions during period: |  |  |
Provision for loan loss reserve | (11,422) | (61,000) | 0
Collections of principal and interest | (97,270) | (112,760) | (42,994)
Balance at close of period | $ 209,566 | $ 297,451 | $ 442,826

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- Definition Deductions during period. + References No definition available. + Details
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- Definition The amount of accretion of discount recorded on mortgage loans on real estate during the reporting period. + References No definition available. + Details
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- Definition The amount of principal and interest collected on mortgage loans on real estate during the reporting period. + References No definition available. + Details
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- Definition Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column G)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Amount of increase in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from new investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 6)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Amount of addition to investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 6)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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