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Stock-Related Benefit Plans - Additional Information (Detail)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
age
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for grant 4,951,108    
Shares granted 2,543,023    
Shares granted, weighted average grant date fair value | $ / shares $ 13.50    
Unrecognized compensation cost relating to unvested restricted stock | $ $ 72.1    
Unrecognized compensation cost relating to unvested restricted stock, recognition period (in years) 2 years 10 months 24 days    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted, vesting period 5 years    
Compensation and benefits expense | $ $ 36.3 $ 36.0 $ 32.7
Stock Incentive Plan Twenty Twelve | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted 2,543,023 2,956,249 2,805,652
Shares granted, weighted average grant date fair value | $ / shares $ 13.50 $ 15.16 $ 15.21
Supplemental Executive Retirement Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Trust held assets of Supplemental Executive Retirement Plan (SERP), shares 1,929,189 1,819,985  
New York Community Bank      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Description of the ESOP Plan All full-time employees who have attained 21 years of age and have completed twelve consecutive months of credited service are eligible to participate in the Employee Stock Ownership Plan (“ESOP”), with benefits vesting on a six-year basis    
Full-time employees, age to participate in plan | age 21    
Shares granted, vesting period 6 years    
Allocated shares to participants in the ESOP 529,531 695,675 617,031
ESOP-related compensation expense | $ $ 5.0 $ 9.2 $ 9.8
New York Community Bank | Third year of employment      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of shares vested 20.00%    
New York Community Bank | Each successive year after third year      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of shares vested 20.00%