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The Company and its Subsidiaries - Additional Information (Detail)
6 Months Ended 12 Months Ended
Jun. 30, 2017
Insurers
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Dec. 31, 2015
shares
May 11, 2015
$ / shares
shares
May 10, 2015
$ / shares
shares
Jan. 05, 2015
shares
Jan. 30, 2014
shares
Related Party Transaction [Line Items]              
Plan Effective Date Mar. 19, 2012            
Common stock, shares authorized 3,500,000,000 3,500,000,000   3,500,000,000 500,000,000    
Preferred stock, shares authorized 10,000,000     10,000,000 5,000,000    
Common stock, par value | $ / shares $ 0.00001 $ 0.00001   $ 0.00001 $ 0.00001    
Convertible preferred stock, par value | $ / shares $ 0.00001     $ 0.00001 $ 0.00001    
Common stock, shares issued 206,714,132 206,380,800          
Common stock, shares outstanding 206,714,132 206,380,800          
WMMRC [Member]              
Related Party Transaction [Line Items]              
Number of primary mortgage insurers | Insurers 7            
Convertible Series A Preferred Stock [Member]              
Related Party Transaction [Line Items]              
Convertible preferred stock, par value | $ / shares $ 0.00001 $ 0.00001          
Convertible preferred stock, shares issued 1,000,000 1,000,000         1,000,000
Convertible preferred stock, shares outstanding 1,000,000 1,000,000          
Redeemable Convertible Series B Preferred Stock [Member]              
Related Party Transaction [Line Items]              
Preferred stock, shares issued 600,000 600,000       600,000  
Preferred stock, shares outstanding 600,000 600,000 600,000        
Preferred stock dividend rate 3.00% 3.00%