Controlling Interest, Ownership Percentage

No definition available.

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- Definition

Related Party Transaction, Accrued Interest on Collateral Held by Related Party

+ References

No definition available.

+ Details

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- Definition

Related Party Transaction, Agreement Period

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- Definition

Related Party Transaction, Automatic Renewal Period

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- Definition

Related Party Transaction, Brokerage Fee, Percent of Premium Assumed

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- Definition

Related Party Transaction, Cancellation Notice Period

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No definition available.

+ Details

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- Definition

Related Party Transaction, Cancellation Notice Period Upon the Occurrence of Certain Early Termination Events

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No definition available.

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- Definition

Related Party Transaction, Collateral Held by Related Party

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No definition available.

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- Definition

Related Party Transaction, Commission Rate, Adjustment Criteria, Loss Ratio Ceiling

+ References

No definition available.

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- Definition

Related Party Transaction, Commission Rate, Adjustment Criteria, Loss Ratio Floor

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- Definition

Related Party Transaction, Commission Rate, Percent of Ceded Written Premiums

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No definition available.

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- Definition

Related Party Transaction, Early Termination Events, Reduction Threshold of Stockholders' Equity

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No definition available.

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- Definition

Related Party Transaction, Future Premiums and Losses Related to Policies

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No definition available.

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- Definition

Related Party Transaction, Maximum Limit of Liability Attaching

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- Definition

Related Party Transaction, Percent Basis Currency Equivalent of Maximum Limit of Liability Attaching

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No definition available.

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- Definition

Related Party Transaction, Percent of Credit Insurance Business to Cede

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No definition available.

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- Definition

Related Party Transaction, Percent of General Liability Business to Cede

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No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Related Party Transaction, Premiums and Losses Related to Policies

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Related Party Transaction, Quarterly Brokerage Fee, Portfolio Threshold

+ References

No definition available.

+ Details

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- Definition

Related Party Transaction, Reinsurance Coverage Threshold

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
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- Definition

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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- Definition

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.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

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

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- Definition

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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No definition available.

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Related Party Transactions - AmTrust (Details)									3 Months Ended		9 Months Ended
Related Party Transactions - AmTrust (Details)	Jul. 01, 2016	Apr. 01, 2012 USD ($)	Jan. 01, 2012 EUR (€)	Apr. 01, 2011 EUR (€)	Mar. 01, 2011	Sep. 01, 2010	Jun. 11, 2008	Jul. 01, 2007 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Jun. 23, 2008 USD ($)	Apr. 11, 2008 USD ($)	Dec. 18, 2007 USD ($)
Related Party Transaction [Line Items]
Net premiums earned									$ 653,866,000	$ 698,278,000	$ 2,074,475,000	$ 1,951,851,000
Loan to related party									$ 167,975,000		$ 167,975,000		$ 167,975,000
Leah Karfunkel
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage									8.00%		8.00%
Leah Karfunkel \| National General Holdings Corp.
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage									41.80%		41.80%
Barry Zyskind
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage									7.60%		7.60%
George Karfunkel, less than 5% ownership
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage									5.00%		5.00%
Founding shareholders \| AmTrust Financial Services, Inc.
Related Party Transaction [Line Items]
Controlling interest, ownership percentage									42.80%		42.80%
AmTrust Financial Services, Inc.
Related Party Transaction [Line Items]
Loan to related party									$ 167,975,000		$ 167,975,000		$ 167,975,000	$ 34,240,000	$ 20,193,000	$ 113,542,000
AmTrust Financial Services, Inc. \| London Interbank Offered Rate (LIBOR)
Related Party Transaction [Line Items]
Basis spread on variable rate									0.90%		0.90%		0.90%
AmTrust Financial Services, Inc. \| Quota Share Reinsurance Agreements \| Commission expense
Related Party Transaction [Line Items]
Expenses recorded from related party transactions									$ 138,171,000	163,336,000	$ 460,667,000	447,767,000
AmTrust Financial Services, Inc. \| AmTrust Quota Share Reinsurance Agreement
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%
AmTrust Financial Services, Inc. \| AmTrust Quota Share Reinsurance Agreement \| Minimum
Related Party Transaction [Line Items]
Commission rate, adjustment criteria, loss ratio floor								81.50%
AmTrust Financial Services, Inc. \| AmTrust Quota Share Reinsurance Agreement \| Maximum
Related Party Transaction [Line Items]
Commission rate, adjustment criteria, loss ratio ceiling								95.00%
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	32.50%			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%
Future premiums and losses related to policies	20.00%
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%
AmTrust Financial Services, Inc. \| AmTrust Technology Reinsurance Agreement \| Premiums Earned
Related Party Transaction [Line Items]
Revenue from related parties									1,000	0	4,000	12,000
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									351,000	305,000	1,182,000	745,000
AmTrust Financial Services, Inc. \| AmTrust NA Reinsurance Agreement \| Commission expense
Related Party Transaction [Line Items]
Expenses recorded from related party transactions									53,000	87,000	256,000	187,000
AmTrust Financial Services, Inc. \| Reinsurer Trust Assets Collateral Agreement
Related Party Transaction [Line Items]
Collateral held by related party									3,245,369,000		3,245,369,000		$ 2,766,032,000
Accrued interest on collateral held by related party									21,288,000		21,288,000		20,420,000
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. \| Reinsurance Brokerage Agreements \| Brokerage expense
Related Party Transaction [Line Items]
Expenses recorded from related party transactions									5,642,000	6,652,000	18,662,000	18,330,000
Balances due to related party									15,476,000		15,476,000		$ 14,395,000
AmTrust Financial Services, Inc. \| Insurance Intermediary \| Brokerage expense
Related Party Transaction [Line Items]
Expenses recorded from related party transactions									54,000	41,000	55,000	42,000
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. \| Asset Management Agreement \| Investment Management Fee
Related Party Transaction [Line Items]
Expenses recorded from related party transactions									1,927,000	1,780,000	5,586,000	5,122,000
AmTrust Financial Services, Inc. \| AmTrust Time Sharing Agreement
Related Party Transaction [Line Items]
Contract extension (in years)					1 year
AmTrust Financial Services, Inc. \| AmTrust Time Sharing Agreement \| Aircraft expenses
Related Party Transaction [Line Items]
Expenses recorded from related party transactions									$ 0	$ 22,000	$ 39,000	$ 61,000
AmTrust Financial Services, Inc. \| National General Holdings Corp.
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage									1.60%		1.60%