Summary of Capital Expenditures (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total capital expenditures	$ 262,560	$ 111,618	$ 76,946
Discontinued operations
Segment Reporting Information [Line Items]
Total capital expenditures		72	532
Owned and managed
Segment Reporting Information [Line Items]
Total capital expenditures	246,333	96,975	55,222
Managed-only
Segment Reporting Information [Line Items]
Total capital expenditures	3,171	3,719	3,507
Corporate and Other
Segment Reporting Information [Line Items]
Total capital expenditures	$ 13,056	$ 10,852	$ 17,685