Summary of Capital Expenditures Including Accrued Amounts (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Total capital expenditures	$ 21,206	$ 12,927
Owned and managed
Segment Reporting Information [Line Items]
Total capital expenditures	16,840	11,278
Managed-only
Segment Reporting Information [Line Items]
Total capital expenditures	780	655
Corporate and Other
Segment Reporting Information [Line Items]
Total capital expenditures	$ 3,586	$ 994