CONDENSED CONSOLIDATED BALANCE SHEET (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash and cash equivalents ($426,184 and $411,550 related to variable interest entities ("VIEs"))	$ 2,014,800	$ 2,154,541
Marketable securities, current ($30,425 and $30,369 related to VIEs)	160,442	137,127
Accounts and notes receivable, net ($256,000 and $193,354 related to VIEs)	1,580,539	1,242,691
Contract work in progress ($247,661 and $221,897 related to VIEs)	1,928,611	1,942,679
Deferred taxes	245,727	249,839
Other current assets	330,686	367,260
Total current assets	6,260,805	6,094,137
Marketable securities, noncurrent	319,150	318,355
Property, plant and equipment ((net of accumulated depreciation of $1,062,925 and $1,032,509) ($103,118 and $105,692 related to VIEs))	947,058	951,255
Investments and goodwill	272,418	244,226
Deferred taxes	70,789	79,357
Deferred compensation trusts	348,593	332,904
Other	244,221	255,809
TOTAL ASSETS	8,463,034	8,276,043
CURRENT LIABILITIES
Trade accounts payable ($290,999 and $295,972 related to VIEs)	2,088,824	1,954,108
Convertible senior notes and other notes payable	18,472	20,792
Advance billings on contracts ($286,746 and $300,491 related to VIEs)	810,019	870,147
Accrued salaries, wages and benefits ($90,355 and $59,183 related to VIEs)	725,596	755,075
Other accrued liabilities ($19,506 and $6,478 related to VIEs)	277,826	286,992
Total current liabilities	3,920,737	3,887,114
LONG-TERM DEBT DUE AFTER ONE YEAR	496,274	520,205
NONCURRENT LIABILITIES	441,117	441,630
CONTINGENCIES AND COMMITMENTS
Capital stock
Preferred - authorized 20,000,000 shares ($0.01 par value); none issued
Common - authorized 375,000,000 shares ($0.01 par value); issued and outstanding - 162,861,327 and 162,359,906 shares in 2013 and 2012, respectively	1,629	1,624
Additional paid-in capital	10,730
Accumulated other comprehensive loss	(265,321)	(257,850)
Retained earnings	3,737,928	3,597,521
Total shareholders' equity	3,484,966	3,341,295
Noncontrolling interests	119,940	85,799
Total equity	3,604,906	3,427,094
TOTAL LIABILITIES AND EQUITY	$ 8,463,034	$ 8,276,043