Premises and Equipment - Summary of Premises and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Land	$ 104,671	$ 105,435
Leasehold improvements	232,936	229,919
Premises and equipment, gross	1,437,117	1,406,579
Less: accumulated depreciation and amortization	761,854	739,897
Premises and equipment, net	675,263	666,682
Owned Assets [Member]
Property, Plant and Equipment [Line Items]
Buildings	448,442	443,507
Furniture and equipment	636,219	614,591
Less: accumulated depreciation and amortization	756,245	732,315
Capital Leases [Member]
Property, Plant and Equipment [Line Items]
Buildings		1,108
Furniture and equipment	14,849	12,019
Less: accumulated depreciation and amortization	$ 5,609	$ 7,582