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Notes Receivable - Loans Receivable on Real Estate (Parenthetical) (Detail) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016
Accounts Notes And Loans Receivable [Line Items] |  |  |
Repayment of notes receivable | $ 30,600 | $ 31,068 | $ 4,934
Notes Receivable [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Debt instrument maturity date | 2017-09 |  |

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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. + References No definition available. + Details
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- Definition The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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