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Financing Agreement - Additional Information (Detail)
1 Months Ended
May 26, 2020
Apr. 09, 2020
USD ($)
Jul. 31, 2018
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2010
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jul. 02, 2018
USD ($)
Mar. 31, 2016
USD ($)
Debt Instrument [Line Items]                  
Repayments of principal in next twelve months           $ 175,000,000      
364 Day Term Loan                  
Debt Instrument [Line Items]                  
Debt term   364 days              
Debt face amount   $ 300,000,000              
Debt extension term   364 days              
Required principal repayments before maturity   $ 0              
Senior Notes | Senior Unsecured Notes 4.60% Due May 2021                  
Debt Instrument [Line Items]                  
Proceeds from Issuance of Debt         $ 75,000,000        
Long-term debt           75,000,000.0 $ 75,000,000.0    
Senior Notes | Senior Unsecured Notes 3.13% Due December 2020                  
Debt Instrument [Line Items]                  
Proceeds from Issuance of Debt       $ 100,000,000          
Long-term debt           100,000,000.0 100,000,000.0    
Senior Notes | Senior Unsecured Notes 4.23% Due July 2028                  
Debt Instrument [Line Items]                  
Long-term debt     $ 350,000,000.0       350,000,000.0    
Notes payable, other | Boat Holdings, LLC                  
Debt Instrument [Line Items]                  
Long-term debt           66,500,000   $ 76,700,000  
Notes payable to banks                  
Debt Instrument [Line Items]                  
Long-term debt           75,000,000.0 81,400,000    
Notes payable to banks | Mortgages [Member]                  
Debt Instrument [Line Items]                  
Long-term debt           8,500,000     $ 14,500,000
Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity     700,000,000            
Revolving loan facility           0 75,100,000    
Repayments of principal in next twelve months     $ 59,000,000            
Minimum interest coverage ratio 2.25   3.00            
Maximum leverage ratio 4.75   3.50            
Term loan                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity     $ 1,180,000,000            
Revolving loan facility           $ 955,000,000.0 $ 1,000,000,000.0