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Financing Agreement - Additional Information (Detail) - USD ($)
1 Months Ended
Dec. 31, 2013
Dec. 31, 2010
Sep. 30, 2019
Dec. 31, 2018
Jul. 31, 2018
Jul. 02, 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     71,722,000     $ 76,733,000  
Notes payable to banks              
Debt Instrument [Line Items]              
Long-term debt     81,388,000 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     60,582,000 187,631,000      
Term loan              
Debt Instrument [Line Items]              
Maximum borrowing capacity         $ 1,180,000,000    
Revolving loan facility     1,105,000,000 $ 1,150,000,000      
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months     $ 59,000,000