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Pension Plans and Postretirement Benefits - Summary of Total Investments Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Separate Account Investment [Line Items]    
Total Assets $ 1,333,309 $ 1,198,816
Unclassified 715,313 541,162
Fixed Income    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 391,418 453,390
Unclassified 162,561 98,326
Commingled and Mutual Funds    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 338,473 334,786
Unclassified 265,709 276,625
U.S. Government Securities    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 316,375 220,606
Unclassified 0 0
Other    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 126,823 47,550
Unclassified 126,823 47,550
Real Estate    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 77,437 65,821
Unclassified 77,437 65,821
Partnerships with Security Holdings    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 49,007 52,840
Unclassified 49,007 52,840
Cash and Accrued Items (1)    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 33,776 23,823
Unclassified 33,776 0
Level 1    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 383,739 291,641
Level 1 | Fixed Income    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 0
Level 1 | Commingled and Mutual Funds    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 72,764 58,161
Level 1 | U.S. Government Securities    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 310,975 216,300
Level 1 | Other    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 0
Level 1 | Real Estate    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 0
Level 1 | Partnerships with Security Holdings    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 0
Level 1 | Cash and Accrued Items (1)    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 17,180
Level 2    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 234,257 366,013
Level 2 | Fixed Income    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 228,857 355,064
Level 2 | Commingled and Mutual Funds    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 0
Level 2 | U.S. Government Securities    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 5,400 4,306
Level 2 | Other    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 0
Level 2 | Real Estate    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 0
Level 2 | Partnerships with Security Holdings    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 0
Level 2 | Cash and Accrued Items (1)    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 6,643
Level 3    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 0
Level 3 | Fixed Income    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 0
Level 3 | Commingled and Mutual Funds    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 0
Level 3 | U.S. Government Securities    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 0
Level 3 | Other    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 0
Level 3 | Real Estate    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 0
Level 3 | Partnerships with Security Holdings    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 0
Level 3 | Cash and Accrued Items (1)    
Fair Value, Separate Account Investment [Line Items]    
Total Assets $ 0 $ 0