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Available for Sale Securities (Detail) - USD ($)
$ in Thousands
Apr. 01, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 6,980,186 $ 6,691,140
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 120,904 114,449
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 41,270 66,971
Fair Value 7,059,820 6,738,618
Tax exempt bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,919,378 3,036,060
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 4,964 2,211
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 9,748 24,649
Fair Value 2,914,594 3,013,622
Taxable bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,616,734 2,469,192
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 1,530 1,359
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 28,113 33,903
Fair Value 2,590,151 2,436,648
Restricted investments    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 164,548 164,548
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0 463
Fair Value 164,548 164,085
Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,279,526 1,021,340
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 114,410 110,879
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 3,409 7,956
Fair Value $ 1,390,527 $ 1,124,263