Summary of Capital Expenditures (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Total capital expenditures	$ 91,179	$ 27,284
Owned and managed
Segment Reporting Information [Line Items]
Total capital expenditures	82,834	25,620
Managed-only
Segment Reporting Information [Line Items]
Total capital expenditures	731	632
Corporate and Other
Segment Reporting Information [Line Items]
Total capital expenditures	$ 7,614	$ 1,032