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Long-Term Debt - Additional Information (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Document Period End Date Jun. 30, 2021  
Long-term debt including current maturities $ 512,900 $ 523,000
Debt Instrument, Unused Borrowing Capacity, Amount $ 310,000  
Uncollateralized Senior Note Due December Two Thousand Thirty Four [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 2.98%  
Term Note Due January Two Thousand Twenty [Member]    
Debt Instrument [Line Items]    
Long-term debt including current maturities $ 70,000 70,000
3.48% note, due May 31, 2038 [Member]    
Debt Instrument [Line Items]    
Long-term debt including current maturities 50,000 50,000
3.25% note, due April 30, 2032 [Member]    
Debt Instrument [Line Items]    
Long-term debt including current maturities 70,000 $ 70,000
New York Life [Member]    
Debt Instrument [Line Items]    
Long-term debt including current maturities [1] 140,000  
Aggregated Unfunded Commitments [Member]    
Debt Instrument [Line Items]    
Long-term debt including current maturities 0  
Aggregate Shelf Agreements [Member]    
Debt Instrument [Line Items]    
Long-term debt including current maturities 360,000  
MetLife [Member]    
Debt Instrument [Line Items]    
Senior notes [1] 150,000  
Debt Instrument, Unused Borrowing Capacity, Amount [1] 150,000  
Prudential [Member]    
Debt Instrument [Line Items]    
Long-term debt including current maturities [1] 220,000  
Debt Instrument, Unused Borrowing Capacity, Amount [1] 150,000  
New York Life [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unused Borrowing Capacity, Amount [1] 10,000  
Maximum [Member] | Aggregate Shelf Agreements [Member]    
Debt Instrument [Line Items]    
Senior notes 670,000  
Maximum [Member] | Prudential [Member]    
Debt Instrument [Line Items]    
Senior notes [1] 370,000  
Maximum [Member] | New York Life [Member]    
Debt Instrument [Line Items]    
Senior notes [1] $ 150,000  
[1] (1) The Prudential, MetLife and NYL Shelf Agreements expire in April 2023, May 2023 and November 2021, respectively.