CONSOLIDATED BALANCE SHEETS Consolidated Balance Sheets Parenthetical (Assets and Liabilities) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012		Mar. 31, 2012
Cash and cash equivalents	$ 260,773		$ 321,990		$ 226,226
Other noncurrent assets	82,531		84,392		69,949
Accounts payable	169,940		202,541		129,480
Billings in excess of costs and estimated earnings	124,609		139,692		87,370
Accrued expenses and other current liabilities	188,685		169,979		148,196
Consolidated Construction Joint Venture [Member] | Joint Venture Consolidated [Member]
Cash and cash equivalents	98,738	[1]	105,865	[1]	69,423	[1]
Receivables, Net, Current	47,040		43,902		36,740
Other noncurrent assets	39,486		42,814		7,516
Accounts payable	26,354		34,536		28,591
Billings in excess of costs and estimated earnings	71,821	[1]	72,490	[1]	24,827	[1]
Accrued expenses and other current liabilities	$ 8,983		$ 8,312		$ 5,640

[1] The volume and stage of completion of contracts from our consolidated construction joint ventures may cause fluctuations in cash and cash equivalents, as well as billings in excess of costs and estimated earnings between periods.