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Reconciliation of Statutory Federal Income Tax (Benefit) Expense Reported in Net Income to Combined Actual Income Tax (Benefit) Expense (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Provision of Income Taxes [Line Items]
Statutory federal income tax at 35%		$ (46,204)	$ 270,573	$ 261,494
State and local income taxes, net of federal income tax effect	[1]	(20,835)	36,394	29,159
Effect of tax deductibility of ESOP		(7,321)	(7,297)	(7,153)
Non-taxable income and expense of BOLI		(9,575)	(9,415)	(10,381)
Federal tax credits		(1,554)	(1,820)	(3,111)
Adjustments relating to prior tax years		(248)	(1,166)	150
Merger-related expenses		850
Other, net		30	400	1,421
Income tax (benefit) expense		$ (84,857)	$ 287,669	$ 271,579
[1] Includes income tax (benefit) expense for the years ended December 31, 2015 and 2014 of $(1.4) million and $600,000, respectively, for adjustments to deferred taxes necessitated by changes in tax laws of New York City and New York State that were enacted in April 2015 and March 2014, respectively.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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