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Activity in Allowance for Losses on Non-Covered Loans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Valuation Allowance [Line Items]      
Balance, beginning of period $ 139,857 $ 141,946  
Charge-offs (2,588) (8,076)  
Recoveries 10,773 5,987  
Transfer from the allowance for losses on covered loans [1] 2,416    
(Recovery of) provision for non-covered loan losses (15,004) (18,587) $ 30,758
Balance, end of period 147,124 139,857 141,946
Non-Covered Loans      
Valuation Allowance [Line Items]      
(Recovery of) provision for non-covered loan losses (3,334)   18,000
Mortgage Receivable      
Valuation Allowance [Line Items]      
Balance, beginning of period 122,616 123,991  
Charge-offs (1,315) (2,780)  
Recoveries 5,765 1,405  
Transfer from the allowance for losses on covered loans [1] 2,250    
Balance, end of period 124,478 122,616 123,991
Mortgage Receivable | Non-Covered Loans      
Valuation Allowance [Line Items]      
(Recovery of) provision for non-covered loan losses (4,838)    
Other loans      
Valuation Allowance [Line Items]      
Balance, beginning of period 17,241 17,955  
Charge-offs (1,273) (5,296)  
Recoveries 5,008 4,582  
Transfer from the allowance for losses on covered loans [1] 166    
Balance, end of period 22,646 $ 17,241 $ 17,955
Other loans | Non-Covered Loans      
Valuation Allowance [Line Items]      
(Recovery of) provision for non-covered loan losses $ 1,504    
[1] Represents the allowance associated with $14.2 million of loans acquired in the Desert Hills transaction that were transferred from covered loans to non-covered loans upon expiration of the related FDIC loss sharing agreement in March 2015.