Reconciliation of Statutory Federal Income Tax Expense Reported in Net Income to Combined Actual Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Provision of Income Taxes [Line Items]
Statutory federal income tax expense at 35%	$ 261,494	$ 273,318	$ 257,102
State and local income taxes, net of federal income tax effect	29,159	25,207	25,306
Effect of tax deductibility of ESOP	(7,153)	(6,910)	(6,739)
Non-taxable income and expense of BOLI	(10,381)	(10,578)	(9,848)
Federal tax credits	(3,111)	(2,083)	(6,194)
Adjustments relating to prior tax years	150	86	(5,152)
Other, net	1,421	763	65
Total income tax expense	$ 271,579	$ 279,803	$ 254,540