Results of Operations Associated with Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011
Discontinued Operations And Disposal Groups [Abstract]
Revenues	$ 17,586,236	$ 24,156,748		$ 27,310,300
Income from operations before income taxes	119,984	330,048		571,339
Gain on sale before income taxes	130,991	0		12,684
Total income from discontinued operations before taxes	250,975	330,048		584,023
Provision for income taxes	15,639	165,666		250,519
Income from discontinued operations	$ 235,336	$ 164,382	[1]	$ 333,504	[1]

[1] Reclassified to conform to current presentation.