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 | 12 Months Ended | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2013
2004 LTIP Plan [Member]
|
Jun. 29, 2004
2004 LTIP Plan [Member]
|
Dec. 31, 2013
2004 LTIP Plan [Member]
Employees [Member]
|
Dec. 31, 2013
2004 LTIP Plan [Member]
Non-Employees Director [Member]
|
Dec. 31, 2013
2004 LTIP Plan [Member]
Minimum [Member]
Non-Employees Director [Member]
|
Dec. 31, 2013
2004 LTIP Plan [Member]
Maximum [Member]
Non-Employees Director [Member]
|
Dec. 31, 2013
Stock Purchase Plan [Member]
|
Dec. 31, 2013
Stock Purchase Plan [Member]
North America, South America and Asia [Member]
|
Dec. 31, 2013
Stock Purchase Plan [Member]
Minimum [Member]
|
Dec. 31, 2013
Stock Purchase Plan [Member]
Maximum [Member]
|
Dec. 31, 2013
Stock Purchase Plan [Member]
Maximum [Member]
Customers and Distributors Based in Europe [Member]
|
Dec. 31, 2013
Staff Share Option Plan [Member]
|
Dec. 31, 2013
Staff Share Option Plan [Member]
2004 LTIP Plan [Member]
|
Dec. 31, 2013
Restricted Stock [Member]
|
Dec. 31, 2012
Restricted Stock [Member]
|
|
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||||||||||||||||||
Amount of shares reserved for issuance | 1,600,000 | 3,100,000 | 1,850,000 | |||||||||||||||
Options outstanding | 1,924,179 | 1,945,955 | 515,917 | 15,000 | 1,243,262 | |||||||||||||
Options exercisable | 1,367,269 | 22,668 | 15,000 | 1,179,601 | ||||||||||||||
Restricted stock outstanding | 286,704 | 160,831 | 279,039 | 7,665 | ||||||||||||||
Award vesting period | 3 years | 3 years | 5 years | 5 years | ||||||||||||||
Number of shares approved for annual grant | 5,000 | |||||||||||||||||
Award Contractual term | 10 years | 10 years | ||||||||||||||||
Full value award limit | 100,000 | |||||||||||||||||
Percentage of compensation eligible employees to be deducted for purchase of common stock | 25.00% | 1.00% | 25.00% | 15.00% | ||||||||||||||
Purchase price of shares equivalent to fair market value | 85.00% | |||||||||||||||||
Shares issued under stock purchase plan | 1,437,519 | |||||||||||||||||
Unamortized compensation expense | $ 2.8 | $ 6.7 | ||||||||||||||||
Weighted average remaining contractual life of exercisable options (in years) | 2 years 10 months 21 days | |||||||||||||||||
Total intrinsic value of options exercised | 0.4 | 7.2 | 4.2 | |||||||||||||||
Closing stock price | $ 22.82 | |||||||||||||||||
Aggregate intrinsic value of options outstanding | 0.5 | 11.2 | 10.8 | |||||||||||||||
Aggregate intrinsic value of options exercisable | $ 0.2 | $ 9.8 | $ 8.4 | |||||||||||||||
Non-vested shares | 269,791 | 269,791 | 149,500 |