Summary of Capital Expenditures Including Accrued Amounts (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Total capital expenditures	$ 73,681	$ 26,463	$ 164,860	$ 53,747
Owned and managed
Segment Reporting Information [Line Items]
Total capital expenditures	70,527	23,851	153,361	49,471
Managed-only
Segment Reporting Information [Line Items]
Total capital expenditures	1,168	767	1,899	1,399
Corporate and Other
Segment Reporting Information [Line Items]
Total capital expenditures	$ 1,986	$ 1,845	$ 9,600	$ 2,877