v3.3.1.900

Segment Information - Net Premiums (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross premiums written	$ 2,662,825	$ 2,507,352	$ 2,204,159
Net premiums written	2,514,116	2,458,136	2,096,301
Net premiums earned	$ 2,429,069	$ 2,251,743	$ 2,000,887
% of Total Net premiums written	100.00%	100.00%	100.00%
% of Total Net premiums earned	100.00%	100.00%	100.00%
Diversified Reinsurance segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross premiums written	$ 776,852	$ 897,748	$ 848,790
Net premiums written	734,781	850,049	763,374
Net premiums earned	$ 744,875	$ 854,026	$ 753,157
% of Total Net premiums written	29.20%	34.60%	36.40%
% of Total Net premiums earned	30.70%	37.90%	37.60%
AmTrust Reinsurance segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross premiums written	$ 1,885,974	$ 1,610,485	$ 1,169,961
Net premiums written	1,779,334	1,610,485	1,169,961
Net premiums earned	$ 1,684,191	$ 1,378,327	$ 988,900
% of Total Net premiums written	70.80%	65.50%	55.80%
% of Total Net premiums earned	69.30%	61.20%	49.40%
Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross premiums written	$ (1)	$ (881)	$ 185,408
Net premiums written	1	(2,398)	162,966
Net premiums earned	$ 3	$ 19,390	$ 258,830
% of Total Net premiums written	0.00%	(0.10%)	7.80%
% of Total Net premiums earned	0.00%	0.90%	13.00%
Property | Diversified Reinsurance segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Net premiums written	$ 160,939	$ 160,308	$ 145,292
Net premiums earned	$ 157,186	$ 174,785	$ 150,261
% of Total Net premiums written	6.40%	6.50%	6.90%
% of Total Net premiums earned	6.50%	7.70%	7.50%
Casualty | Diversified Reinsurance segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Net premiums written	$ 435,625	$ 535,518	$ 473,732
Net premiums earned	$ 449,000	$ 533,775	$ 472,095
% of Total Net premiums written	17.30%	21.80%	22.60%
% of Total Net premiums earned	18.50%	23.70%	23.60%
Accident and Health | Diversified Reinsurance segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Net premiums written	$ 64,102	$ 38,870	$ 35,340
Net premiums earned	$ 55,672	$ 39,918	$ 36,165
% of Total Net premiums written	2.60%	1.60%	1.70%
% of Total Net premiums earned	2.30%	1.80%	1.80%
International | Diversified Reinsurance segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Net premiums written	$ 74,115	$ 115,353	$ 109,010
Net premiums earned	$ 83,017	$ 105,548	$ 94,636
% of Total Net premiums written	2.90%	4.70%	5.20%
% of Total Net premiums earned	3.40%	4.70%	4.70%
Small Commercial Business | AmTrust Reinsurance segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Net premiums written	$ 1,057,968	$ 857,576	$ 572,006
Net premiums earned	$ 984,333	$ 752,188	$ 493,774
% of Total Net premiums written	42.10%	34.90%	27.30%
% of Total Net premiums earned	40.50%	33.40%	24.70%
Specialty Program | AmTrust Reinsurance segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Net premiums written	$ 332,416	$ 220,121	$ 157,578
Net premiums earned	$ 290,209	$ 175,286	$ 140,478
% of Total Net premiums written	13.20%	8.90%	7.50%
% of Total Net premiums earned	11.90%	7.80%	7.00%
Specialty Risk and Extended Warranty | AmTrust Reinsurance segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Net premiums written	$ 388,950	$ 532,788	$ 440,377
Net premiums earned	$ 409,649	$ 450,853	$ 354,648
% of Total Net premiums written	15.50%	21.70%	21.00%
% of Total Net premiums earned	16.90%	20.00%	17.70%
North America
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross premiums written	$ 2,165,309	$ 1,979,768	$ 1,742,333
Net premiums written	2,038,444	1,934,644	1,638,844
Net premiums earned	2,027,141	1,778,579	1,602,128
Other (predominantly Europe)
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross premiums written	497,516	527,584	461,826
Net premiums written	475,672	523,492	457,457
Net premiums earned	$ 401,928	$ 473,164	$ 398,759

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.1)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(c))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 235
-Section S99
-Paragraph 2
-Subparagraph (SX 210.12-17)
-URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 1
-Article 7

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 17
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-Topic 944
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-Section 50
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