Summary of Capital Expenditures Including Accrued Amounts (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Total capital expenditures	$ 32,139	$ 22,998	$ 75,978	$ 107,279
Owned and managed
Segment Reporting Information [Line Items]
Total capital expenditures	18,701	17,687	53,630	88,418
Managed-only
Segment Reporting Information [Line Items]
Total capital expenditures	1,576	1,793	3,390	3,134
Corporate and Other
Segment Reporting Information [Line Items]
Total capital expenditures	$ 11,862	$ 3,518	$ 18,958	$ 15,727