CONDENSED CONSOLIDATED BALANCE SHEET (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash and cash equivalents related to variable interest entities ("VIEs")	$ 2,014,800	$ 2,154,541
Marketable securities, current related to VIEs	160,442	137,127
Accounts and notes receivable related to VIEs	1,580,539	1,242,691
Contract work in progress related to VIEs	1,928,611	1,942,679
Property, plant and equipment, net of accumulated depreciation related to VIEs	947,058	951,255
Property, plant and equipment, accumulated depreciation	1,062,925	1,032,509
CURRENT LIABILITIES
Trade accounts payable related to VIEs	2,088,824	1,954,108
Advance billings on contracts related to VIEs	810,019	870,147
Accrued salaries, wages and benefits related to VIEs	725,596	755,075
Other accrued liabilities related to VIEs	277,826	286,992
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)	162,861,327	162,359,906
Common stock, outstanding shares (in shares)	162,861,327	162,359,906
Consolidated variable interest entities
CURRENT ASSETS
Cash and cash equivalents related to variable interest entities ("VIEs")	426,184	411,550
Marketable securities, current related to VIEs	30,425	30,369
Accounts and notes receivable related to VIEs	256,000	193,354
Contract work in progress related to VIEs	247,661	221,897
Property, plant and equipment, net of accumulated depreciation related to VIEs	103,118	105,692
CURRENT LIABILITIES
Trade accounts payable related to VIEs	290,999	295,972
Advance billings on contracts related to VIEs	286,746	300,491
Accrued salaries, wages and benefits related to VIEs	90,355	59,183
Other accrued liabilities related to VIEs	$ 19,506	$ 6,478