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Related Party Transactions - AmTrust (Details)
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6 Months Ended | 0 Months Ended | 1 Months Ended | 2 Months Ended | 6 Months Ended | 9 Months Ended | 15 Months Ended | 21 Months Ended | 55 Months Ended | 3 Months Ended | 6 Months Ended | 27 Months Ended | 3 Months Ended | 6 Months Ended | 24 Months Ended | 42 Months Ended | 66 Months Ended | 34 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 10 Months Ended | 34 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 15 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 27 Months Ended | 3 Months Ended | 6 Months Ended | 72 Months Ended | 3 Months Ended | 6 Months Ended | 10 Months Ended | 3 Months Ended | 6 Months Ended | 2 Months Ended | 15 Months Ended | 2 Months Ended | 15 Months Ended | 0 Months Ended | |||||||||||||||||||||||||||||||||
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Jun. 30, 2013
USD ($)
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Dec. 31, 2012
USD ($)
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Jun. 30, 2013
Founding Shareholders [Member]
AmTrust Financial Services, Inc. [Member]
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
USD ($)
|
Dec. 31, 2012
AmTrust Financial Services, Inc. [Member]
USD ($)
|
Feb. 09, 2009
AmTrust Financial Services, Inc. [Member]
AmTrust Quota Share Reinsurance Agreement [Member]
USD ($)
|
Jun. 11, 2008
AmTrust Financial Services, Inc. [Member]
AmTrust Quota Share Reinsurance Agreement [Member]
USD ($)
|
Jul. 31, 2007
AmTrust Financial Services, Inc. [Member]
AmTrust Quota Share Reinsurance Agreement [Member]
USD ($)
|
Mar. 06, 2013
AmTrust Financial Services, Inc. [Member]
AmTrust Quota Share Reinsurance Agreement [Member]
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
AmTrust Quota Share Reinsurance Agreement [Member]
|
Dec. 31, 2011
AmTrust Financial Services, Inc. [Member]
AmTrust Quota Share Reinsurance Agreement [Member]
|
Mar. 31, 2011
AmTrust Financial Services, Inc. [Member]
AmTrust Quota Share Reinsurance Agreement [Member]
|
Dec. 31, 2012
AmTrust Financial Services, Inc. [Member]
AmTrust Quota Share Reinsurance Agreement [Member]
|
Dec. 31, 2012
AmTrust Financial Services, Inc. [Member]
AmTrust Quota Share Reinsurance Agreement [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
AmTrust Quota Share Reinsurance Agreement [Member]
Commissions Paid [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
AmTrust Quota Share Reinsurance Agreement [Member]
Commissions Paid [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
AmTrust Quota Share Reinsurance Agreement [Member]
Commissions Paid [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
AmTrust Quota Share Reinsurance Agreement [Member]
Commissions Paid [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
AmTrust European Hospital Liability Quota Share Agreement [Member]
EUR (€)
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Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
AmTrust European Hospital Liability Quota Share Agreement [Member]
Commissions Paid [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
AmTrust European Hospital Liability Quota Share Agreement [Member]
Commissions Paid [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
AmTrust European Hospital Liability Quota Share Agreement [Member]
Commissions Paid [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
AmTrust European Hospital Liability Quota Share Agreement [Member]
Commissions Paid [Member]
USD ($)
|
Dec. 31, 2009
AmTrust Financial Services, Inc. [Member]
AmTrust Workers' Compensation Reinsurance Agreement [Member]
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Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
AmTrust Workers' Compensation Reinsurance Agreement [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
AmTrust Workers' Compensation Reinsurance Agreement [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
AmTrust Technology Reinsurance Agreement [Member]
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
AmTrust Technology Reinsurance Agreement [Member]
Commissions Paid [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
AmTrust Technology Reinsurance Agreement [Member]
Commissions Paid [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
AmTrust Technology Reinsurance Agreement [Member]
Commissions Paid [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
AmTrust Technology Reinsurance Agreement [Member]
Commissions Paid [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
AmTrust Technology Reinsurance Agreement [Member]
Premiums Earned [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
AmTrust Technology Reinsurance Agreement [Member]
Premiums Earned [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
AmTrust Technology Reinsurance Agreement [Member]
Premiums Earned [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
AmTrust Technology Reinsurance Agreement [Member]
Premiums Earned [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
Southern General Agency Program Reinsurance Agreement [Member]
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
Southern General Agency Program Reinsurance Agreement [Member]
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
Southern General Agency Program Reinsurance Agreement [Member]
Commissions Paid [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
Southern General Agency Program Reinsurance Agreement [Member]
Commissions Paid [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
Southern General Agency Program Reinsurance Agreement [Member]
Commissions Paid [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
Southern General Agency Program Reinsurance Agreement [Member]
Commissions Paid [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
Southern General Agency Program Reinsurance Agreement [Member]
Premiums Earned [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
Southern General Agency Program Reinsurance Agreement [Member]
Premiums Earned [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
Southern General Agency Program Reinsurance Agreement [Member]
Premiums Earned [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
Southern General Agency Program Reinsurance Agreement [Member]
Premiums Earned [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
AmTrust NA Reinsurance Agreement [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
AmTrust NA Reinsurance Agreement [Member]
Commissions Paid [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
AmTrust NA Reinsurance Agreement [Member]
Commissions Paid [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
AmTrust NA Reinsurance Agreement [Member]
Commissions Paid [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
AmTrust NA Reinsurance Agreement [Member]
Premiums Earned [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
AmTrust NA Reinsurance Agreement [Member]
Premiums Earned [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
AmTrust NA Reinsurance Agreement [Member]
Premiums Earned [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
Reinsurer Trust Assets Collateral Agreement [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
Reinsurance Brokerage Agreements [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
Reinsurance Brokerage Agreements [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
Reinsurance Brokerage Agreements [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
Reinsurance Brokerage Agreements [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
Reinsurance Brokerage Agreements [Member]
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
Reinsurance Brokerage Agreements [Member]
Brokerage Expense [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
Reinsurance Brokerage Agreements [Member]
Brokerage Expense [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
Reinsurance Brokerage Agreements [Member]
Brokerage Expense [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
Reinsurance Brokerage Agreements [Member]
Brokerage Expense [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
Asset Management Agreement [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
Asset Management Agreement [Member]
Investment Management Fees [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
Asset Management Agreement [Member]
Investment Management Fees [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
Asset Management Agreement [Member]
Investment Management Fees [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
Asset Management Agreement [Member]
Investment Management Fees [Member]
USD ($)
|
Dec. 31, 2011
AmTrust Financial Services, Inc. [Member]
AmTrust Time Sharing Agreement [Member]
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
AmTrust Time Sharing Agreement [Member]
Aircraft Expenses [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
AmTrust Time Sharing Agreement [Member]
Aircraft Expenses [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
AmTrust Time Sharing Agreement [Member]
Aircraft Expenses [Member]
USD ($)
|
Jun. 30, 2012
AmTrust Financial Services, Inc. [Member]
AmTrust Time Sharing Agreement [Member]
Aircraft Expenses [Member]
USD ($)
|
Jun. 30, 2013
AmTrust Financial Services, Inc. [Member]
National General Holdings Corp. [Member]
|
Jun. 30, 2013
Michael Karfunkel 2005 Grantor Retained Annuity Trust [Member]
National General Holdings Corp. [Member]
|
Jun. 30, 2013
Michael Karfunkel [Member]
National General Holdings Corp. [Member]
|
Mar. 06, 2013
Minimum [Member]
AmTrust Financial Services, Inc. [Member]
AmTrust Quota Share Reinsurance Agreement [Member]
|
Jun. 30, 2013
Minimum [Member]
AmTrust Financial Services, Inc. [Member]
AmTrust NA Reinsurance Agreement [Member]
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Mar. 06, 2013
Maximum [Member]
AmTrust Financial Services, Inc. [Member]
AmTrust Quota Share Reinsurance Agreement [Member]
|
Jun. 30, 2013
Maximum [Member]
AmTrust Financial Services, Inc. [Member]
AmTrust NA Reinsurance Agreement [Member]
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Jun. 04, 2013
Series A Preferred Stock [Member]
AmTrust Financial Services, Inc. [Member]
National General Holdings Corp. [Member]
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Jun. 06, 2013
Common Stock [Member]
AmTrust Financial Services, Inc. [Member]
National General Holdings Corp. [Member]
|
Jun. 05, 2013
Common Stock [Member]
AmTrust Financial Services, Inc. [Member]
National General Holdings Corp. [Member]
USD ($)
|
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| Related Party Transaction [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Ownership percentage | 58.00% | 15.40% | 41.40% | 15.80% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shares owned | 53,054 | 12,295,430 | 42,958 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Stock split, conversion ratio | 286.22 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Number of shares issued (in shares) | 21,850,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Common shares, par value | $ 0.01 | $ 0.01 | $ 0.01 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Percent of premiums written, net of cost of unaffiliated inuring reinsurance from related party | 100.00% | 40.00% | 100.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Unearned premiums | $ 1,129,796,000 | $ 936,497,000 | $ 82,200,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Percent of losses with respect to current lines of business, excluding those above covered business threshold to related party | 40.00% | 40.00% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Covered business threshold | 5,000,000 | 5,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Premiums and losses related to covered business to cede | 40.00% | 40.00% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Commission rate, percent of ceded written premiums | 31.00% | 34.375% | 30.00% | 31.00% | 31.00% | 34.375% | 5.00% | 5.00% | 5.00% | 10.00% | 27.50% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Commission rate, adjustment to percent of ceded written premiums | 1.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Commission rate, adjusted percent of ceded written premiums | 30.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Commission rate, adjustment criteria, threshold percent of specialty risk and extended warranty to covered business | 42.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Commission rate, adjustment criteria 2, floor percent of specialty risk and extended warranty to covered business | 38.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Commission rate, reduced adjustment to percent of ceded written premiums | 0.50% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Commission rate, reduced adjustment to percent of ceded written premiums | 30.50% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Contract extension | 1 year | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Contract extension | 3 years | 1 year | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cancellation notice period | 9 months | 30 days | 30 days | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cancellation notice period upon the occurrence of certain early termination events | 30 days | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Early termination events, reduction threshold of stockholders' equity | 50.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Premiums and losses related to policies | 40.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Maximum limit of liability attaching | 2,000,000 | 5,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Percent basis currency equivalent of maximum limit of liability attaching | 100.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Profit sharing commencement period | 2 years | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Portion of excess performance to be shared | 50.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Agreement period | 3 years | 1 year | 1 year | 10 months | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Revenue from related parties | 182,000 | 2,734,000 | 689,000 | 5,034,000 | 57,000 | 18,000 | 94,000 | 33,000 | 1,138,000 | 367,000 | 1,875,000 | 651,000 | 150,000 | 47,000 | 199,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Percent of gross liabilities, from related party | 100.00% | 80.00% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Percent of gross liabilities, from third party | 20.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses recorded from related party transactions | 71,284,000 | 41,250,000 | 132,412,000 | 85,129,000 | 1,645,000 | 1,242,000 | 2,896,000 | 2,434,000 | 28,000 | 821,000 | 156,000 | 1,517,000 | 29,000 | 9,000 | 56,000 | 3,267,000 | 2,098,000 | 6,021,000 | 4,196,000 | 1,061,000 | 885,000 | 2,102,000 | 1,715,000 | 19,000 | 32,000 | 19,000 | 13,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Percent participation in reinsurance program | 45.00% | 40.00% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Excess reinsurance coverage above threshold | 9,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Reinsurance coverage threshold | 1,000,000 | 1,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Reinsurance coverage limit | 10,000,000 | 10,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual aggregate deductible | 1,250,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Remaining percent participation in single carrier | 55.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Percent of credit insurance business to cede | 90.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Percent of general liability business to cede | 100.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Loan to related party | 167,975,000 | 167,975,000 | 167,975,000 | 167,975,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Loan to related party, Basis spread on LIBOR | 0.90% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Loan to related party, LIBOR basis spread assessment period | 360 days | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Collateral held by related party | 964,770,000 | 857,013,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accrued interest on collateral held by related party | 7,271,000 | 6,967,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Brokerage fee, percent of premium assumed | 1.25% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Reserve for loss and loss adjustment expenses | 8,210,000 | 6,299,000 | 8,210,000 | 6,299,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Brokerage fees paid | 0 | 0 | 1,000 | 0 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Quarterly brokerage fee, below portfolio threshold, percent of average holdings | 0.05% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Quarterly brokerage fee, portfolio threshold | $ 1,000,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Quarterly brokerage fee, above portfolio threshold, percent of average holdings | 0.0375% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Commission rate, adjustment criteria, loss ratio floor | 81.50% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Commission rate, adjustment criteria, loss ratio ceiling | 95.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||