Schedule of Total Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total assets	$ 3,159,771	$ 3,127,191
Owned and managed
Segment Reporting Information [Line Items]
Total assets	2,784,343	2,745,905
Managed-only
Segment Reporting Information [Line Items]
Total assets	63,513	68,146
Corporate and Other
Segment Reporting Information [Line Items]
Total assets	$ 311,915	$ 313,140