CONSOLIDATED BALANCE SHEETS Consolidated Balance Sheets Parenthetical (Assets and Liabilities) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Cash and cash equivalents	$ 146,458	$ 229,121	$ 247,833
Property and equipment, net	426,700	436,859	470,893
Accounts payable	210,777	160,706	188,124
Billings in excess of costs and estimated earnings	125,957	138,375	144,462
Accrued expenses and other current liabilities	187,348	197,242	200,758
Consolidated Construction Joint Venture [Member] | Joint Venture Consolidated [Member]
Cash and cash equivalents	29,109	38,800	63,806
Receivables, Net, Current	45,825	38,372	59,807
Property and equipment, net	16,957	22,216	34,891
Accounts payable	26,246	16,937	18,297
Billings in excess of costs and estimated earnings	27,876	60,185	72,094
Accrued expenses and other current liabilities	$ 3,805	$ 11,299	$ 9,153