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Related Party Transaction, Percent of Losses With Respect to Current Lines of Business, Excluding Those Above Covered Business Threshold To Related Party

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Related Party Transaction, Percent of Premium Written, Net of Cost of Unaffiliated Inuring Reinsurance From Related Party

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Related Party Transaction, Percent of Gross Liabilities, From Third Party

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Related Party Transaction, Quarterly Brokerage Fee, Above Portfolio Threshold, Percent of Average Holdings

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Related Party Transaction, Reinsurance Coverage Threshold

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Carrying amount as of the balance sheet date of obligations due all related parties.

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For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

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The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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Related Party Transactions - AmTrust (Details)											12 Months Ended
Related Party Transactions - AmTrust (Details)	Mar. 07, 2013	Sep. 01, 2012	Apr. 01, 2012 USD ($)	Jan. 01, 2012 EUR (€)	Apr. 01, 2011 EUR (€)	Mar. 01, 2011	Sep. 01, 2010	Jun. 01, 2008	Jul. 01, 2007 USD ($)	Apr. 01, 2007	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Related Party Transaction [Line Items]
Net premiums earned											$ 2,429,069,000	$ 2,251,743,000	$ 2,000,887,000
Loan to related party											$ 167,975,000	167,975,000
Founding shareholders
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage											20.30%
Founding shareholders \| AmTrust Financial Services, Inc.
Related Party Transaction [Line Items]
Controlling interest, ownership percentage											47.90%
AmTrust Financial Services, Inc.
Related Party Transaction [Line Items]
Loan to related party											$ 167,975,000	167,975,000
AmTrust Financial Services, Inc. \| AmTrust Quota Share Reinsurance
Related Party Transaction [Line Items]
Percent of premiums written, net of cost of unaffiliated inuring reinsurance from related party									40.00%
Percent of losses with respect to current lines of business, excluding those above covered business threshold to related party									40.00%
Commission rate, percent of ceded written premiums								34.375%	31.00%
Contract extension (in years)	3 years
Cancellation notice period	9 months
Cancellation notice period upon the occurrence of certain early termination events (in days)	30 days
Early termination events, reduction threshold of stockholders' equity	50.00%
Consideration paid for agreement to commute certain liabilities including unearned premiums and loss reserves											107,000,000
AmTrust Financial Services, Inc. \| AmTrust European Hospital Liability Quota Share Agreement
Related Party Transaction [Line Items]
Commission rate, percent of ceded written premiums					5.00%
Premiums and losses related to policies					40.00%
Maximum limit of liability attaching \| €				€ 10,000,000	€ 5,000,000
Percent basis currency equivalent of maximum limit of liability attaching					100.00%
AmTrust Financial Services, Inc. \| AmTrust SNIC Reinsurance Agreement
Related Party Transaction [Line Items]
Percent of premiums written, net of cost of unaffiliated inuring reinsurance from related party		100.00%
Percent of credit insurance business to cede							80.00%
Percent of gross liabilities, from third party							20.00%
Percent of general liability business to cede							5.00%
Percent of gross liabilities, from related party		100.00%
AmTrust Financial Services, Inc. \| AmTrust Technology Reinsurance Agreement
Related Party Transaction [Line Items]
Commission rate, percent of ceded written premiums							5.00%
Percent of credit insurance business to cede							90.00%
Percent of general liability business to cede							100.00%
Agreement period (in years)							3 years
AmTrust Financial Services, Inc. \| AmTrust NA Reinsurance Agreement
Related Party Transaction [Line Items]
Agreement period (in years)			1 year
Reinsurance coverage threshold			$ 1,000,000
Net premiums earned											673,000	1,241,000	643,000
AmTrust Financial Services, Inc. \| Reinsurer Trust Assets Collateral Agreement
Related Party Transaction [Line Items]
Collateral held by related party											2,256,383,000	1,691,970,000
Accrued interest on collateral held by related party											$ 15,448,000	$ 10,413,000
AmTrust Financial Services, Inc. \| Reinsurance Brokerage Agreements
Related Party Transaction [Line Items]
Cancellation notice period										30 days
Brokerage fee, percent of premium assumed										1.25%
AmTrust Financial Services, Inc. \| Asset Management Agreement
Related Party Transaction [Line Items]
Cancellation notice period									30 days
Quarterly brokerage fee, above portfolio threshold, percent of average holdings									0.0375%
Quarterly brokerage fee, portfolio threshold									$ 1,000,000,000
AmTrust Financial Services, Inc. \| AmTrust Time Sharing Agreement
Related Party Transaction [Line Items]
Contract extension (in years)						1 year
AmTrust Financial Services, Inc. \| National General Holdings Corp.
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage											11.60%
Leah Karfunkel \| National General Holdings Corp.
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage											43.10%
Minimum \| AmTrust Financial Services, Inc. \| AmTrust Quota Share Reinsurance
Related Party Transaction [Line Items]
Commission rate, adjustment criteria, loss ratio floor									81.50%
Maximum \| AmTrust Financial Services, Inc. \| AmTrust Quota Share Reinsurance
Related Party Transaction [Line Items]
Commission rate, adjustment criteria, loss ratio ceiling									95.00%
LIBOR \| AmTrust Financial Services, Inc.
Related Party Transaction [Line Items]
Loan to related party, Basis spread on LIBOR											0.90%	0.90%
Commission expense \| AmTrust Financial Services, Inc. \| Quota Share Reinsurance Agreements
Related Party Transaction [Line Items]
Expenses recorded from related party transactions											$ 518,196,000	$ 401,679,000	279,197,000
Commission expense \| AmTrust Financial Services, Inc. \| AmTrust SNIC Reinsurance Agreement
Related Party Transaction [Line Items]
Expenses recorded from related party transactions											0	90,000	239,000
Commission expense \| AmTrust Financial Services, Inc. \| AmTrust Technology Reinsurance Agreement
Related Party Transaction [Line Items]
Expenses recorded from related party transactions											3,000	8,000	186,000
Commission expense \| AmTrust Financial Services, Inc. \| AmTrust NA Reinsurance Agreement
Related Party Transaction [Line Items]
Expenses recorded from related party transactions											166,000	262,000	158,000
Premiums earned \| AmTrust Financial Services, Inc. \| AmTrust SNIC Reinsurance Agreement
Related Party Transaction [Line Items]
Revenue from related parties											0	1,796,000	4,785,000
Premiums earned \| AmTrust Financial Services, Inc. \| AmTrust Technology Reinsurance Agreement
Related Party Transaction [Line Items]
Revenue from related parties											68,000	171,000	928,000
Brokerage expense \| AmTrust Financial Services, Inc. \| Reinsurance Brokerage Agreements
Related Party Transaction [Line Items]
Expenses recorded from related party transactions											21,475,000	17,229,000	12,361,000
Balances due to related party											13,464,000	11,423,000
Investment management fees \| AmTrust Financial Services, Inc. \| Asset Management Agreement
Related Party Transaction [Line Items]
Expenses recorded from related party transactions											6,057,000	5,214,000	4,388,000
Aircraft expenses \| AmTrust Financial Services, Inc. \| AmTrust Time Sharing Agreement
Related Party Transaction [Line Items]
Expenses recorded from related party transactions											$ 89,000	$ 88,000	$ 57,000