Subsequent Event - Additional Information (Detail) - USD ($)		3 Months Ended
Apr. 23, 2020	Mar. 31, 2020
Subsequent Event [Line Items]
Proceeds from sale of property		$ 14,218,000
Subsequent Event [Member] \| Tempe, Arizona, and El Segundo and Santa Monica, California Properties [Member]
Subsequent Event [Line Items]
Proceeds from sale of property	$ 86,000,000

The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585

Name:	us-gaap_ProceedsFromSaleOfPropertyHeldForSale
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration