Schedule of Assets for Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total assets	$ 2,917,160	$ 2,974,742
Owned and managed
Segment Reporting Information [Line Items]
Total assets	2,631,937	2,654,791
Managed-only
Segment Reporting Information [Line Items]
Total assets	97,254	119,191
Corporate and Other
Segment Reporting Information [Line Items]
Total assets	$ 187,969	$ 200,760