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Financing Agreement - Additional Information (Detail) - USD ($)
1 Months Ended
Jul. 31, 2018
Dec. 31, 2013
Dec. 31, 2010
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2015
Senior Notes | Senior Unsecured Notes 3.81% Due May 2018            
Debt Instrument [Line Items]            
Proceeds from Issuance of Debt     $ 25,000,000      
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 $ 75,000,000  
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       100,000,000 100,000,000  
Senior Notes | Senior Unsecured Notes 4.23% Due July 2028            
Debt Instrument [Line Items]            
Proceeds from Issuance of Debt $ 350,000,000          
Long-term debt         350,000,000  
Notes payable, other | Boat Holdings, LLC            
Debt Instrument [Line Items]            
Long-term debt       76,733,000    
Notes payable to banks            
Debt Instrument [Line Items]            
Long-term debt       86,399,000 87,608,000  
Notes payable to banks | Mortgages [Member]            
Debt Instrument [Line Items]            
Long-term debt       9,666,000   $ 14,500,000
Revolving Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity 700,000,000          
Revolving loan facility       154,299,000 187,631,000  
Term loan            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 1,180,000,000          
Revolving loan facility       1,120,000,000 $ 1,150,000,000  
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months       $ 59,000,000