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Business Acquisitions (Detail) - USD ($)
$ in Thousands
Feb. 11, 2019
Jan. 28, 2019
Oct. 16, 2018
Sep. 10, 2018
Apr. 03, 2018
Mar. 26, 2018
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Business Acquisition [Line Items]                  
Unallocated assets from acquisitions             $ 575,079 $ 14,210  
Goodwill             903,461 $ 904,571  
Fishing Hot Spots [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Consideration Transferred           $ 7,100      
Identifiable Intangible assets             2,200    
Goodwill             4,700    
Fishidy [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Consideration Transferred         $ 7,100        
Identifiable Intangible assets                 $ 3,800
Goodwill                 $ 4,600
Acyclica [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Consideration Transferred       $ 10,300          
Unallocated assets from acquisitions             9,913    
SeaPilot [Member]                  
Business Acquisition [Line Items]                  
Unallocated assets from acquisitions             4,306    
Aeryon [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Consideration Transferred   $ 210,600              
Unallocated assets from acquisitions             192,812    
Endeavor [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Consideration Transferred $ 386,800                
Unallocated assets from acquisitions             $ 368,047    
Unallocated Assets from Acquisitions [Member] | SeaPilot [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Consideration Transferred     $ 4,600