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Other Income, Net - Additional Information (Detail) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($) Parcel	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($) Parcel
Disclosure Other Income Net Additional Information Detail [Line Items]
Insurance recoveries	$ 4.7	$ 0.2	$ 5.0	$ 0.4
Number of land parcels | Parcel		2		2
Net proceeds				$ 19.5
Pre-tax gain on sale of land				11.9
Infrastructure reimbursement			9.1	4.0
Tremont
Disclosure Other Income Net Additional Information Detail [Line Items]
Net proceeds				18.9
City Of Henderson
Disclosure Other Income Net Additional Information Detail [Line Items]
Infrastructure reimbursement			$ 8.8	3.1
NL
Disclosure Other Income Net Additional Information Detail [Line Items]
Net proceeds				$ 0.6

X

- Definition

The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

+ References

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 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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X

- Definition

The cash inflow from the sale of land held for investment; excludes sales of land held as inventory or productive use.

+ References

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=109223946&loc=d3e3179-108585

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- Definition

Disclosure Other Income Net Additional Information Detail [Line Items]

+ References

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- Definition

Infrastructure development cost reimbursed.

+ References

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- Definition

Number of land parcels.

+ References

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- Definition

Pre tax gain on sale of land.

+ References

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