Summary of Capital Expenditures Including Accrued Amounts for Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Total capital expenditures	$ 18,437	$ 28,599	$ 59,814	$ 66,116
Owned and managed
Segment Reporting Information [Line Items]
Total capital expenditures	14,903	22,699	43,989	54,182
Managed-only
Segment Reporting Information [Line Items]
Total capital expenditures	670	2,261	3,706	4,733
Discontinued operations
Segment Reporting Information [Line Items]
Total capital expenditures		79		242
Corporate and Other
Segment Reporting Information [Line Items]
Total capital expenditures	$ 2,864	$ 3,560	$ 12,119	$ 6,959