Summary of Capital Expenditures Including Accrued Amounts (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Total capital expenditures	$ 22,633	$ 71,354	$ 43,839	$ 84,281
Owned and managed
Segment Reporting Information [Line Items]
Total capital expenditures	18,089	59,453	34,929	70,731
Managed-only
Segment Reporting Information [Line Items]
Total capital expenditures	1,034	686	1,814	1,341
Corporate and Other
Segment Reporting Information [Line Items]
Total capital expenditures	$ 3,510	$ 11,215	$ 7,096	$ 12,209