Summary of Capital Expenditures Including Accrued Amounts (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Total capital expenditures	$ 298,897	$ 32,139	$ 394,322	$ 75,978
Safety
Segment Reporting Information [Line Items]
Total capital expenditures	13,166	14,027	38,018	37,861
Community
Segment Reporting Information [Line Items]
Total capital expenditures	1,202	7,273	9,621	20,393
Properties
Segment Reporting Information [Line Items]
Total capital expenditures	282,968	9,507	336,670	15,064
Corporate and Other
Segment Reporting Information [Line Items]
Total capital expenditures	$ 1,561	$ 1,332	$ 10,013	$ 2,660