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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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Date when debt instrument is scheduled to be paid.

+ References

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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

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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

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