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Acquisitions - Summary of Preliminary Allocation of Purchase Price (Detail) - USD ($)
$ in Thousands
Sep. 29, 2018
Aug. 10, 2018
Feb. 01, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill $ 114,097     $ 74,484
Southern Counties [Member]        
Business Acquisition [Line Items]        
Current assets   $ 5,359    
Property and equipment   4,598    
Goodwill   29,618    
Intangible assets   35,690    
Other assets   1,427    
Current liabilities   (3,027)    
Deferred tax liabilities, net   (7,983)    
Total purchase price   $ 65,682    
Fore [Member]        
Business Acquisition [Line Items]        
Current assets     $ 6,077  
Property and equipment     10,864  
Goodwill     9,995  
Intangible assets     12,108  
Current liabilities     (1,234)  
Deferred tax liabilities, net     (2,705)  
Total purchase price     $ 35,105