Schedule of Total Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total assets	$ 3,242,766	$ 3,271,604
Owned and managed
Segment Reporting Information [Line Items]
Total assets	2,796,248	2,841,799
Managed-only
Segment Reporting Information [Line Items]
Total assets	69,424	62,292
Corporate and Other
Segment Reporting Information [Line Items]
Total assets	$ 377,094	$ 367,513