Acquisitions and Dispositions - Purchase Price Allocation (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Business Acquisition [Line Items]    
Goodwill $ 413,178 $ 398,042
CPO (Final) [Member]    
Business Acquisition [Line Items]    
Purchase price, net of cash acquired 32,225  
Accounts receivable (2,956)  
Inventories (13,051)  
Other current assets (269)  
Property, plant and equipment, net (488)  
Intangible assets (12,800)  
Total assets acquired (29,564)  
Accounts payable 16,911  
Accrued liabilities 2,580  
Deferred income taxes 3,453  
Other long-term liabilities 90  
Total liabilities assumed 23,034  
Goodwill 25,695  
MEDCO (Preliminary) [Member]    
Business Acquisition [Line Items]    
Purchase price, net of cash acquired 145,873  
Accounts receivable (44,815)  
Inventories (55,491)  
Other current assets (1,299)  
Property, plant and equipment, net (4,408)  
Other assets (650)  
Intangible assets (40,000)  
Total assets acquired (146,663)  
Accounts payable 32,383  
Accrued liabilities 5,542  
Deferred income taxes 2,716  
Other long-term liabilities 52  
Total liabilities assumed 40,693  
Goodwill 39,903  
Nestor Sales LLC (Preliminary) [Member]    
Business Acquisition [Line Items]    
Purchase price, net of cash acquired 39,939  
Accounts receivable (9,230)  
Inventories (10,442)  
Other current assets (339)  
Property, plant and equipment, net (1,251)  
Other assets (752)  
Intangible assets (17,670)  
Total assets acquired (39,684)  
Accounts payable 4,992  
Accrued liabilities 1,912  
Deferred income taxes 3,875  
Other long-term liabilities 76  
Total liabilities assumed 10,855  
Goodwill $ 11,110