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Financing Agreement - Additional Information (Detail) - USD ($)
1 Months Ended
Dec. 31, 2013
Dec. 31, 2010
Sep. 30, 2018
Jul. 31, 2018
Dec. 31, 2017
Nov. 30, 2016
Sep. 30, 2015
Aug. 31, 2011
Senior Notes | Senior Unsecured Notes 3.81% Due May 2018                
Debt Instrument [Line Items]                
Proceeds from Issuance of Debt   $ 25,000,000            
Long-term debt     $ 0   $ 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   0      
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     87,608,000   12,384,000      
Notes payable to banks | Mortgages [Member]                
Debt Instrument [Line Items]                
Long-term debt     10,875,000       $ 14,500,000  
Revolving Credit Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity     600,000,000 $ 700,000,000     $ 500,000,000 $ 350,000,000
Revolving loan facility     74,023,000   3,000,000      
Term loan                
Debt Instrument [Line Items]                
Maximum borrowing capacity       $ 1,180,000,000   $ 750,000,000    
Debt Instrument, Face Amount     500,000,000          
Revolving loan facility     1,165,000,000   $ 680,000,000      
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months     $ 59,000,000