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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
Share data in Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Significant Accounting Policies [Line Items]      
Research and development $ 78,158,000 $ 67,156,000 $ 57,884,000
Goodwill planning period 5 years    
Pre-tax non-cash Impairment charge on goodwill 200,520,000    
Goodwill and intangible assets 2,866,000,000    
Aggregate balance of investments under cost method 6,900,000 3,800,000  
Reserves for policy claims 44,300,000 49,000,000  
Dilutive effects of stock options and restricted stock awards and units 1,519 1,257 1,107
Stock options excluded from the calculation of diluted earnings 2,140 3,711 5,283
FARADYNE
      
Significant Accounting Policies [Line Items]      
Equity method investment, ownership percentage 50.00% 50.00%  
Investments in and loans to affiliate 6,000,000 6,100,000  
Goodwill and identifiable intangible assets
      
Significant Accounting Policies [Line Items]      
Percentage of total assets 62.50%    
Insurance Subsidiary
      
Significant Accounting Policies [Line Items]      
Reserves for policy claims 13,300,000 12,000,000  
Other Noncurrent Liabilities
      
Significant Accounting Policies [Line Items]      
Reserves for policy claims 31,000,000 37,000,000  
Water & Fluid Solutions
      
Significant Accounting Policies [Line Items]      
Pre-tax non-cash Impairment charge on goodwill 200,500,000    
Impairment charges, related to trade names 0 0 11,300,000
Credit Concentration Risk
      
Significant Accounting Policies [Line Items]      
Number of customers 0 0  
Contract based
      
Significant Accounting Policies [Line Items]      
Prepaid expenses and other current assets related to contracts 54,700,000 0  
Other current liabilities related to these contracts $ 17,700,000 $ 0  
Minimum
      
Significant Accounting Policies [Line Items]      
Equity method investment, ownership percentage 20.00%    
Perpetual growth rate 3.00%    
Discounted cash flows discount rate 12.60%    
Maximum
      
Significant Accounting Policies [Line Items]      
Equity method investment, ownership percentage 50.00%    
Perpetual growth rate 3.50%    
Discounted cash flows discount rate 14.00%    
Percentage of recognized income tax positions that could be realized at the largest amount 50.00%    
Maximum | Credit Concentration Risk
      
Significant Accounting Policies [Line Items]      
Customer receivable balances to total trade receivables 10.00% 10.00%