Schedule of Assets for Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Total assets	$ 2,967,675	$ 3,019,631
Owned and managed
Segment Reporting Information [Line Items]
Total assets	2,651,489	2,711,926
Managed-only
Segment Reporting Information [Line Items]
Total assets	126,544	123,806
Corporate and Other
Segment Reporting Information [Line Items]
Total assets	189,630	180,220
Discontinued operations
Segment Reporting Information [Line Items]
Total assets	$ 12	$ 3,679