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STOCKHOLDERS' EQUITY - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2017
Dec. 31, 2016
Aug. 03, 2017
May 10, 2017
Feb. 07, 2017
Dec. 05, 2016
Class Of Stock [Line Items]              
Common stock, shares authorized   2,000,000,000 2,000,000,000        
Common stock, par value   $ 0.1 $ 0.1        
Common stock, shares issued   220,382,343 218,700,394        
Common stock, shares outstanding   216,278,040 217,446,205        
Granted shares of restricted stock   1,099,756          
Corporation has authorized shares of preferred stock   50,000,000 50,000,000        
Preferred stock, par value   $ 1          
Liquidation value per share   $ 25          
Repurchased of common stock   438,891 291,759        
Treasury Stock Shares   4,104,303 1,254,189        
Secondary Offering Of Common Stock       20,000,000   20,000,000  
Purchase Of Common Stock Secondary Offering           3,000,000 2,700,000
Conversion Of Stock Shares Issued1 852,831            
Legal Surplus Amount   $ 59,693 $ 52,436        
Legal Surplus Amount Additions   $ 7,300 $ 9,600        
Minimum [Member]              
Class Of Stock [Line Items]              
Legal surplus reserve rate   10.00%          
Omnibus Plan [Member]              
Class Of Stock [Line Items]              
Restricted stock granted to senior executive officers   7,558,450          
Restricted Stock [Member]              
Class Of Stock [Line Items]              
Repurchased of common stock   243,102 65,498        
Forefeited   2,411,223          
Number of vested shares   1,050,356          
Thomas H Lee Partners [Member]              
Class Of Stock [Line Items]              
Percentage Of Stock Ownership   5.00%          
Secondary Offering Of Common Stock       10,000,000   10,000,000 9,000,000
Oaktree Capital Management [Member]              
Class Of Stock [Line Items]              
Percentage Of Stock Ownership   5.00%          
Secondary Offering Of Common Stock       10,000,000   10,000,000 9,000,000
Department Of Treasury [Member]              
Class Of Stock [Line Items]              
Secondary Offering Of Common Stock         10,291,553    
7.125% Noncumulative Perpetual Monthly Income Preferred Stock, Series A [Member]              
Class Of Stock [Line Items]              
Preferred stock dividend rate percentage   7.125%          
8.35% Noncumulative Perpetual Monthly Income Preferred Stock, Series B [Member]              
Class Of Stock [Line Items]              
Preferred stock dividend rate percentage   8.35%          
7.40% Noncumulative Perpetual Monthly Income Preferred Stock, Series C [Member]              
Class Of Stock [Line Items]              
Preferred stock dividend rate percentage   7.40%          
7.25% Noncumulative Perpetual Monthly Income Preferred Stock, Series D [Member]              
Class Of Stock [Line Items]              
Preferred stock dividend rate percentage   7.25%          
7.00% Noncumulative Perpetual Monthly Income Preferred Stock, Series E [Member]              
Class Of Stock [Line Items]              
Preferred stock dividend rate percentage   7.00%