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Financing Agreement - Additional Information (Detail) - USD ($)
1 Months Ended
Dec. 31, 2013
Dec. 31, 2010
Mar. 31, 2019
Dec. 31, 2018
Jul. 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]            
Long-term debt     350,000,000 350,000,000    
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     342,640,000 187,631,000    
Term loan            
Debt Instrument [Line Items]            
Maximum borrowing capacity         $ 1,180,000,000  
Revolving loan facility     1,135,000,000 $ 1,150,000,000    
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months     $ 59,000,000