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Discontinued Operations and Divestitures - Gains on Disposals of Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Discontinued Operations And Disposal Groups [Abstract]                      
Gain on disposal of discontinued operations, before income tax expense                 $ 107,533 $ 142 $ 207
Income tax expense                 49,197 52 193
Gain on disposal of discontinued operations, net of tax $ 93 $ 56,315 $ 1,905 $ 23 $ 18 $ 32 $ 18 $ 22 $ 58,336 $ 90 $ 14