Rendering

Component: (Network and Table)
Network
2416404 - Disclosure - Share Based Compensation (Fair Value Assumptions) (Details)
(http://www.amtrustgroup.com/role/ShareBasedCompensationFairValueAssumptionsDetails)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001365555 (http://www.sec.gov/CIK)
Share-based Compensation [Abstract]Period [Axis]
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
2013-01-01 - 2013-12-31
Share-based Compensation [Abstract]
 
 
 
Volatility
.4081  
.4172  
.3350  
Risk-free interest rate
.0197  
.0262  
.0101  
Weighted average expected lives in years
P6Y3M  
P6Y3M  
P6Y3M  
Dividend rate
.0184  
.0177  
.0167  
Forfeiture rate
.0050  
.0050  
.0050