Components of Other Operating Expenses (Detail) (USD $) In Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Component of Operating Other Cost and Expense [Line Items]
Construction expense	$ 29,805		$ 20,654		$ 55,910		$ 41,139
Insurance subsidiary operating expenses	4,170	[1]	4,472	[1]	8,051	[1]	8,542	[1]
Foreign exchange gain	(2,114)		(10)		(2,105)		(999)
Other	(778)		32		(3,440)		(6)
Total other operating expenses	$ 31,083		$ 25,148		$ 58,416		$ 48,676

[1] Insurance subsidiary operating expenses are primarily comprised of incurred but not reported loss reserves, loss adjustment expenses and policy acquisition costs.