Schedule of Total Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total assets	$ 3,655,660	$ 3,272,398
Safety
Segment Reporting Information [Line Items]
Total assets	2,621,880	2,643,609
Community
Segment Reporting Information [Line Items]
Total assets	281,198	253,978
Properties
Segment Reporting Information [Line Items]
Total assets	606,770	220,235
Corporate and Other
Segment Reporting Information [Line Items]
Total assets	$ 145,812	$ 154,576