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Condensed Statements of Income (Loss) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]      
Interest income $ 1,582,239 $ 1,674,869 $ 1,691,584
Dividends received from subsidiaries (336,000)    
Other income 44,506 41,613 74,200
Operating expenses 641,218 638,109 615,600
Income tax benefit (202,014) (281,727) 84,857
Net (Loss) income 466,201 495,401 (47,156)
Parent Company      
Condensed Financial Statements, Captions [Line Items]      
Interest income 943 527 1,027
Dividends received from subsidiaries 336,000 330,000 345,000
Other income 1,700 679 527
Gross income 338,643 331,206 346,554
Operating expenses 54,333 49,157 48,255
Income before income tax benefit and equity in underdistributed (overdistributed) earnings of subsidiaries 284,310 282,049 298,299
Income tax benefit 19,575 19,592 20,720
Income before equity in underdistributed (overdistributed) earnings of subsidiaries 303,885 301,641 319,019
Equity in underdistributed (overdistributed) earnings of subsidiaries 162,316 193,760 (366,175)
Net (Loss) income $ 466,201 $ 495,401 $ (47,156)