Effect of Revision on Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Property and equipment, net	$ 16,934,817	$ 16,771,677
Other assets	1,153,763	1,107,753
Total assets	19,804,405	19,653,829
Accrued expenses and other liabilities	564,272	553,218
Total current liabilities	3,067,642	3,445,173
Retained earnings	5,823,430	5,259,998
Total shareholders' equity	8,407,823	7,900,752	7,489,781	6,803,012
Total liabilities and shareholders' equity	19,804,405	19,653,829
As Previously Reported
Property and equipment, net		16,769,181
Other assets		1,151,324
Total assets		19,694,904
Accrued expenses and other liabilities		552,543
Total current liabilities		3,444,498
Retained earnings		5,301,748
Total shareholders' equity		7,942,502
Total liabilities and shareholders' equity		19,694,904
Adjustment
Property and equipment, net		2,496
Other assets		(43,571)
Total assets		(41,075)
Accrued expenses and other liabilities		675
Total current liabilities		675
Retained earnings		(41,750)
Total shareholders' equity		(41,750)
Total liabilities and shareholders' equity		$ (41,075)