CONSOLIDATED BALANCE SHEET (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
CURRENT ASSETS
Cash and cash equivalents related to variable interest entities ("VIEs")	$ 2,154,541	$ 2,161,411
Marketable securities, current related to VIEs	137,127	96,438
Accounts and notes receivable related to VIEs	1,242,691	1,234,023
Contract work in progress related to VIEs	1,942,679	1,946,747
Net property, plant and equipment related to VIEs	951,255	921,585
CURRENT LIABILITIES
Trade accounts payable related to VIEs	1,954,108	1,734,686
Advance billings on contracts related to VIEs	870,147	1,092,707
Accrued salaries, wages and benefits related to VIEs	755,075	668,107
Other accrued liabilities related to VIEs	286,992	323,241
Shareholders' equity
Preferred stock, authorized shares (in shares)	20,000,000	20,000,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, issued shares (in shares)	0	0
Common stock, authorized shares (in shares)	375,000,000	375,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, issued shares (in shares)	162,359,906	168,979,199
Common stock, outstanding shares (in shares)	162,359,906	168,979,199
Consolidated variable interest entities
CURRENT ASSETS
Cash and cash equivalents related to variable interest entities ("VIEs")	411,550	472,597
Marketable securities, current related to VIEs	30,369
Accounts and notes receivable related to VIEs	193,354	167,238
Contract work in progress related to VIEs	221,897	264,014
Net property, plant and equipment related to VIEs	105,692	117,755
CURRENT LIABILITIES
Trade accounts payable related to VIEs	295,972	239,522
Advance billings on contracts related to VIEs	300,491	469,644
Accrued salaries, wages and benefits related to VIEs	59,183	39,581
Other accrued liabilities related to VIEs	$ 6,478	$ 23,427