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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
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
Goodwill planning period 5 years    
Goodwill and intangible assets 2,866,000,000    
Pre-tax non-cash Impairment charge on goodwill 200,520,000    
Aggregate balance of investments under cost method 6,900,000 3,800,000  
Reserves for policy claims 44,300,000 49,000,000  
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%