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Acquisitions (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Sep. 30, 2017
Business Acquisition [Line Items]        
Business Combination, Acquired Receivable, Fair Value     $ 10,836,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory     11,635,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment     3,281,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets     2,063,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable     (7,756,000)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities     (4,669,000)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net     25,230,000  
Goodwill     11,882,000  
Payments to Acquire Businesses, Gross   $ 37,112,000 37,112,000  
Payments to Acquire Businesses, Net of Cash Acquired $ 0 17,396,000    
Other Payments to Acquire Businesses   901,000    
Business Acquisition, Contingent Consideration, at Fair Value   $ 20,617,000 20,617,000 $ 10,000,000
Business Combination, Assets and Liabilities Arising from Contingencies, Amount Recognized, Net     10,617,000  
Trademarks [Member]        
Business Acquisition [Line Items]        
Finite-lived Intangible Assets Acquired     4,630,000  
Customer Relationships [Member]        
Business Acquisition [Line Items]        
Finite-lived Intangible Assets Acquired     $ 5,210,000