Consolidated Balance Sheets Parentheticals (Assets and Liabilities) (Parentheticals) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Cash and cash equivalents	$ 321,990	$ 256,990
Other noncurrent assets	84,392	70,716
Accounts payable	202,541	158,660
Billings in excess of cost	139,692	90,845
Accrued expenses and other current liabilities	169,979	166,790
Joint Venture Consolidated [Member] | Consolidated Construction Joint Venture [Member]
Cash and cash equivalents	105,865	75,122
Receivables, Net, Current	43,903	30,332
Other noncurrent assets	39,915	8,671
Accounts payable	34,536	38,193
Billings in excess of cost	72,490	22,251
Accrued expenses and other current liabilities	$ 8,312	$ 5,129