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2416405 - Disclosure - Share Based Compensation (Summary of Restricted Stock and RSU Activity) (Details)
(http://www.amtrustgroup.com/role/ShareBasedCompensationSummaryOfRestrictedStockAndRsuActivityDetails)
TableSchedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001365555 (http://www.sec.gov/CIK)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]Period [Axis]
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
2013-01-01 - 2013-12-31
Award Type [Axis]Award Type [Axis]Award Type [Axis]
Performance Shares (PSU)Restricted Stock and Restricted Stock Unit [Member]Performance Shares (PSU)Restricted Stock and Restricted Stock Unit [Member]Performance Shares (PSU)Restricted Stock and Restricted Stock Unit [Member]
Shares or Units
 
 
 
 
 
 
Non-vested at beginning of period
549,670  
2,611,022  
318,906  
1,834,030  
0  
1,776,394  
Granted
373,628  
476,942  
338,150  
1,804,716  
319,426  
582,860  
Vested
(155,842) 
(1,200,800) 
(79,420) 
(995,068) 
0  
(524,062) 
Forfeited
(14,990) 
(33,648) 
(27,966) 
(32,656) 
(520) 
(1,162) 
Non-vested at end of period
752,466  
 
1,853,516  
 
549,670  
 
2,611,022  
 
318,906  
 
1,834,030  
 
Weighted Average Grant Date Fair Value
 
 
 
 
 
 
Non-vested at beginning of period
19.42  
16.70  
14.67  
12.22  
.00  
10.43  
Granted
29.93  
29.27  
22.60  
19.60  
14.67  
15.59  
Vested
18.86  
15.66  
14.67  
13.69  
.00  
9.91  
Forfeited
28.13  
20.95  
17.20  
16.60  
14.65  
14.65  
Non-vested at end of period
24.58  
20.54  
19.42  
16.70  
14.67  
12.22