XML 18 R29.htm IDEA: XBRL DOCUMENT v2.4.0.6
Details of Movement in Restructuring Provisions Recognized (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]    
Initial provision recognized $ 4,412 $ 4,500
Cash payments (2,120)  
Foreign exchange movement (9)  
Provision balance at end of period 2,283  
Restructuring - Fiscal 2012 Plan
    
Restructuring Cost and Reserve [Line Items]    
Initial provision recognized   4,644
Cash payments (498) (3,854)
Foreign exchange movement   (4)
Provision balance at end of period 288 786
Workforce Reduction
    
Restructuring Cost and Reserve [Line Items]    
Initial provision recognized 3,903  
Cash payments (2,120)  
Foreign exchange movement (9)  
Provision balance at end of period 1,774  
Workforce Reduction | Restructuring - Fiscal 2012 Plan
    
Restructuring Cost and Reserve [Line Items]    
Initial provision recognized   3,394
Cash payments (157) (3,030)
Foreign exchange movement   (4)
Provision balance at end of period 203 360
Office Consolidations
    
Restructuring Cost and Reserve [Line Items]    
Initial provision recognized 509  
Provision balance at end of period 509  
Office Consolidations | Restructuring - Fiscal 2012 Plan
    
Restructuring Cost and Reserve [Line Items]    
Initial provision recognized   1,250
Cash payments (341) (824)
Provision balance at end of period $ 85 $ 426