v2.4.0.6

Related Party Transactions (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2012
Text Block [Abstract] |
Results of Operations Related to Reinsurance Agreements | The following is the effect on the Company’s results of operations for the three and nine months ended September 30, 2012 and 2011 related to Maiden Reinsurance agreements:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(Amounts in Thousands) | 2012 |  | 2011 |  | 2012 |  | 2011
Results of operations: |  |  |  |  |  |  |
Premium written – ceded | $ | (189,655 | ) |  | $ | (173,218 | ) |  | $ | (576,936 | ) |  | $ | (513,859 | )
Change in unearned premium – ceded | 10,541 |  |  | 13,008 |  |  | 61,502 |  |  | 103,022 |
Earned premium - ceded | $ | (179,114 | ) |  | $ | (160,210 | ) |  | $ | (515,434 | ) |  | $ | (410,837 | )
Ceding commission on premium written | $ | 51,955 |  |  | $ | 48,339 |  |  | $ | 157,224 |  |  | $ | 132,224 |
Ceding commission – deferred | (2,095 | ) |  | (6,557 | ) |  | (16,540 | ) |  | (20,269 | )
Ceding commission – earned | $ | 49,860 |  |  | $ | 41,782 |  |  | $ | 140,684 |  |  | $ | 111,955 |
Incurred loss and loss adjustment expense – ceded | $ | 158,646 |  |  | $ | 94,371 |  |  | $ | 407,426 |  |  | $ | 275,434 |

X
- Definition Income Statement Data Resulting from Related Party Transactions + References No definition available. + Details
Name: | afsi_IncomeStatementDataResultingFromRelatedPartyTransactionsTextBlock
Namespace Prefix: | afsi_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_TextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration