Summary of Capital Expenditures Including Accrued Amounts (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Total capital expenditures	$ 58,658	$ 107,787	$ 223,518	$ 161,534
Owned and managed
Segment Reporting Information [Line Items]
Total capital expenditures	41,775	101,920	195,136	151,391
Managed-only
Segment Reporting Information [Line Items]
Total capital expenditures	1,074	872	2,973	2,271
Corporate and Other
Segment Reporting Information [Line Items]
Total capital expenditures	$ 15,809	$ 4,995	$ 25,409	$ 7,872