Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

Name:	us-gaap_DebtSecuritiesTradingRealizedGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Mortgage Notes, Term Loans, and Secured Revolving Credit Facilities - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
	Mar. 09, 2020	Jun. 30, 2020	Jun. 30, 2020
Debt Instrument [Line Items]
Realized loss		$ (5.0)	$ (4.7)
Mezzanine Loan [Member]
Debt Instrument [Line Items]
Realized loss	$ (0.9)