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Income Taxes - Difference Between Actual Income Tax Expense and Tax Provision Computed by Applying Statutory Federal Income Tax Rate to Income Before Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income before income tax expense:                      
U.S.                 $ 512,733 $ 486,393 $ 755,982
Foreign                 405,348 692,878 580,034
Income before income tax expense 185,041 234,847 246,758 251,435 203,547 334,849 344,026 296,849 918,081 1,179,271 1,336,016
Expected income tax expense at federal statutory rate                 321,328 412,745 467,606
Foreign earnings of foreign subsidiaries (not taxed at the statutory federal income tax rate) net of related foreign taxes                 (166,251) (189,051) (191,789)
Foreign earnings of foreign subsidiaries for which U.S. federal income taxes have been provided                 28,252 (14,681) 29,736
Foreign taxes of domestic and foreign subsidiaries for which U.S. federal income taxes have also been provided                 35,722 65,521 119,009
Foreign tax credits                 (45,824) (67,232) (89,809)
Interest capitalized by foreign subsidiaries                 (11,764) (3,924)  
Reduction of deferred tax liability related to a goodwill deduction resulting from a prior period stock acquisition                   (2,950) (8,850)
Uncertain tax positions                 6,325 (7,733) 30,950
Amortization of deferred charges associated with intercompany rig sales to other tax jurisdictions                 31,276 29,556 30,442
Net expense (benefit) in connection with resolutions of tax issues and adjustments relating to prior years                 (2,152) (6,085) (7,346)
Other                 692 563 610
Income tax expense                 $ 197,604 $ 216,729 $ 380,559