Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Allocation of Purchase Price (Details)

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Acquisitions - Allocation of Purchase Price (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 01, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Allocation of the purchase price paid to the fair value of the net assets for acquisition            
Goodwill   $ 241,006   $ 241,006   $ 241,006
Revenues   124,832 $ 125,339 372,242 $ 336,958  
Pre-tax operating losses   11,069 15,081 36,011 $ 31,464  
Arrowhead Equipment, Inc. [Member]            
Acquisition            
Total consideration $ 7,385          
Allocation of the purchase price paid to the fair value of the net assets for acquisition            
Accounts receivable 852          
Inventories 1,547          
Prepaid and other current assets 6          
Property and equipment 624          
Goodwill 2,720          
Intangible assets 2,700          
Accounts payable and other current liabilities (957)          
Unfavorable lease (107)          
Total $ 7,385          
Revenues   2,583   8,324    
Pre-tax operating losses   $ 220   $ 791    
Amortization period of goodwill, for income tax purpose         15 years  
Arrowhead Equipment, Inc. [Member] | Selling, general and administrative expenses            
Acquisition            
Transactions expenses     $ (70)   $ 418