Other Income, Net - Additional Information (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($) Parcel	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($) Parcel
Disclosure Other Income Net Additional Information Detail [Line Items]
Insurance recoveries	$ 0.2	$ 0.5	$ 5.2	$ 0.9
Number of land parcels | Parcel		2		2
Net proceeds			4.8	$ 19.5
Pre-tax gain on sale of land	4.4			11.9
Infrastructure reimbursement			9.2	4.3
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	$ 4.6			$ 0.6