Summary of Capital Expenditures Including Accrued Amounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total capital expenditures	$ 487,136	$ 114,747	$ 134,531
Safety
Segment Reporting Information [Line Items]
Total capital expenditures	94,559	55,712	79,018
Community
Segment Reporting Information [Line Items]
Total capital expenditures	15,689	35,489	36,447
Properties
Segment Reporting Information [Line Items]
Total capital expenditures	365,628	18,327	12,549
Corporate and Other
Segment Reporting Information [Line Items]
Total capital expenditures	$ 11,260	$ 5,219	$ 6,517