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Financing Agreement - Additional Information (Detail) - USD ($)
1 Months Ended
Apr. 09, 2020
Dec. 31, 2013
Dec. 31, 2010
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Jul. 31, 2018
Jul. 02, 2018
Dec. 31, 2015
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      
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       49,500,000 75,100,000        
Repayments of principal in next twelve months             59,000,000    
Term loan                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity             $ 1,180,000,000    
Revolving loan facility       $ 970,000,000.0 $ 1,000,000,000.0