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Share based compensation plans - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [Member]
Dec. 31, 2012
Staff Share Option Plan [Member]
Dec. 31, 2012
Stock Purchase Plan [Member]
North America, South America And Asia [Member]
Dec. 31, 2012
Stock Purchase Plan [Member]
Maximum [Member]
Dec. 31, 2012
Stock Purchase Plan [Member]
Maximum [Member]
Customers and distributors based in Europe [Member]
Dec. 31, 2012
Stock Purchase Plan [Member]
Minimum [Member]
Dec. 31, 2012
2004 LTIP Plan [Member]
Jun. 29, 2004
2004 LTIP Plan [Member]
Dec. 31, 2012
2004 LTIP Plan [Member]
Staff Share Option Plan [Member]
Dec. 31, 2012
2004 LTIP Plan [Member]
Employees [Member]
Dec. 31, 2012
2004 LTIP Plan [Member]
Non-Employees Director [Member]
Dec. 31, 2012
2004 LTIP Plan [Member]
Maximum [Member]
Non-Employees Director [Member]
Dec. 31, 2012
2004 LTIP Plan [Member]
Minimum [Member]
Non-Employees Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Amount of shares reserved for issuance                     1,600,000 3,100,000          
Options exercisable 1,448,293         29,600         156,000   1,218,693        
Restricted stock outstanding 160,831 69,000                 125,500   35,331        
Award vesting period           5 years               3 years   5 years 3 years
Number of shares approved for annual grant                             5,000    
Award Contractual term           10 years             10 years        
Full value award limit                     100,000            
Options outstanding 1,945,955 2,559,272       29,600             1,460,355        
Percentage of compensation eligible employees to be deducted for purchase of common stock             25.00% 25.00% 15.00% 1.00%              
Purchase price of shares equivalent to fair market value 85.00%                                
Aggregate number of shares reserved for issuance under the Employee Stock Purchase Plan 1,850,000                                
Shares issued under stock purchase plan 1,362,808                                
Unamortized compensation expense $ 3.9     $ 4.8                          
Weighted average remaining contractual life of exercisable options (in years) 4 years 2 months 12 days                                
Total intrinsic value of options exercised 7.2 4.2 3.0                            
Closing stock price $ 39.33                                
Aggregate intrinsic value of options outstanding 11.2 10.8 4.8                            
Aggregate intrinsic value of options exercisable $ 9.8 $ 8.4 $ 2.1                            
Non-vested shares 149,500     149,500 94,000