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Results of Operations Associated with Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Discontinued Operations And Disposal Groups [Abstract]    
Revenues $ 1,432,386 $ 5,515,538
Income (loss) before income taxes, including a gain on disposal of $74,928 in 2013 (17,295) 132,921
Income tax benefit (3,262) (44,995)
Income (loss) from discontinued operations $ (14,033) $ 177,916 [1]
[1] Reclassified to conform to current presentation.