Income Taxes - Schedule of Income Taxes Expenses Benefit Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income taxes at statutory federal income tax rate	$ 586,142	$ 574,786	$ 617,949
Increase (decrease) in taxes:
Tax-exempt income	(33,102)	(31,752)	(34,747)
State and city income taxes, net of federal income tax effect	60,988	50,788	65,834
Qualified affordable housing project federal tax credits, net	(15,297)	(14,827)	(17,994)
Other	(3,706)	(2,996)	(3,954)
Income taxes	$ 595,025	$ 575,999	$ 627,088