v2.4.0.6
Defined benefit plan (Details) (USD $)
 2 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2012
Defined benefit plan    
Expected contribution to pension plans   $ 1,400,000
Net annual periodic pension cost    
Service cost benefits earned 103,000 782,000
Interest cost on benefit obligation 90,000 613,000
Expected return on plan assets (89,000) (622,000)
Net period benefit cost 105,000 773,000
Change in benefit obligation    
Benefit obligation at beginning of the year (11,909,000) (12,725,000)
Service cost (103,000) (782,000)
Interest cost (90,000) (613,000)
Actuarial loss (599,000) (2,301,000)
Employee contributions (11,000) (74,000)
Benefit paid   27,000
Foreign currency translation adjustment (13,000) (282,000)
Benefit obligation at end of year (12,725,000) (16,750,000)
Change in plan assets    
Fair value of plan assets at beginning of the year 10,525,000 10,482,000
Actual return on plan assets' Employee contributions (65,000) 815,000
Employer contributions   363,000
Employee contributions 11,000 74,000
Benefit paid   (27,000)
Foreign currency translation adjustment 11,000 232,000
Fair value of plan assets at end of year 10,482,000 11,939,000
Funded status at end of year - excess of obligation over assets (2,243,000) (4,811,000)
Amount recognized in the balance sheet    
Non-current liabilities 2,243,000 4,811,000
Amounts recognized in accumulated OCI    
Unrecognized loss 489,000 1,263,000
Balances of significant components of the pension plan    
Projected benefit obligation 12,725,000 16,750,000
Accumulated benefit obligation 9,900,000 13,061,000
Fair value of plan assets $ 10,482,000 $ 11,939,000