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Activity in Allowance for Losses on Non-Covered Loans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Valuation Allowance [Line Items]      
Balance, beginning of period $ 158,290 $ 147,124  
Charge-offs (63,350) (3,583)  
Recoveries 2,163 2,875  
Provision for (recovery of) non-covered loan losses 37,242 4,180 $ (15,004)
Balance, end of period 158,046 158,290 147,124
Non-Covered Loans      
Valuation Allowance [Line Items]      
Provision for (recovery of) non-covered loan losses 60,943 11,874 (3,334)
Mortgage Receivable      
Valuation Allowance [Line Items]      
Balance, beginning of period 125,416 124,478  
Charge-offs (375) (170)  
Recoveries 605 1,272  
Balance, end of period 128,275 125,416 124,478
Mortgage Receivable | Non-Covered Loans      
Valuation Allowance [Line Items]      
Provision for (recovery of) non-covered loan losses 2,629 (164)  
Other loans      
Valuation Allowance [Line Items]      
Balance, beginning of period 32,874 22,646  
Charge-offs (62,975) (3,413)  
Recoveries 1,558 1,603  
Balance, end of period 29,771 32,874 $ 22,646
Other loans | Non-Covered Loans      
Valuation Allowance [Line Items]      
Provision for (recovery of) non-covered loan losses $ 58,314 $ 12,038