Income Taxes - Difference Between Total Tax Expense and Amount Computed by Applying Statutory Federal Income Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Statutory rate applied to income	$ 365,506	$ 356,626	$ 311,782
Plus state income taxes, net of Federal tax benefit	28,823	30,227	26,790
Earnings in jurisdictions taxed at rates different from the statutory US tax rate	(37,873)	(17,419)	(13,443)
Capital loss expiration	16,803
Reversal of capital loss valuation allowance	(16,803)
Other	2,889	1,457	561
Income tax expense, total	$ 359,345	$ 370,891	$ 325,690