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Long-Term Debt and Credit Facilities - Narrative (Details)
1 Months Ended 6 Months Ended 12 Months Ended
Mar. 30, 2015
USD ($)
Apr. 07, 2008
Jun. 30, 2003
USD ($)
Trust
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2014
Oct. 25, 2013
USD ($)
Jul. 01, 2009
USD ($)
Apr. 08, 2005
USD ($)
Trust
Debt Instrument [Line Items]                    
Intercompany debt       $ 0 $ 0          
AGC Trust Preferred Securities [Member]                    
Debt Instrument [Line Items]                    
Basis points   2.50%                
AGM Trust Preferred Securities [Member]                    
Debt Instrument [Line Items]                    
Basis points     2.00%              
AGM [Member] | AGM CPS securities [Member]                    
Debt Instrument [Line Items]                    
Maximum stock purchase obligation of each custodial trust     $ 50,000,000.0              
Aggregate maximum stock purchase obligation of the custodial trusts     $ 200,000,000              
Number of custodial trusts | Trust     4              
Rate basis for income distributions     one-month LIBOR              
Auction interval (in days)     28 days              
AGC [Member] | AGM CPS securities [Member]                    
Debt Instrument [Line Items]                    
Maximum stock purchase obligation of each custodial trust                   $ 200,000,000
Aggregate maximum stock purchase obligation of the custodial trusts                   $ 50,000,000.0
Number of custodial trusts | Trust                   4
Rate basis for income distributions   one-month LIBOR                
Line of Credit [Member] | Strip Coverage Facility [Member] | AGM [Member]                    
Debt Instrument [Line Items]                    
Cumulative strip par exposure terminated       1,400,000,000            
Commitment amount       1,000,000,000            
Covenant terms, additional net worth requirement under reduced borrowing capacity       $ 0            
Covenant terms, maximum debt-to-capital ratio                 30.00%  
Covenant terms, minimum net worth percentage                 75.00%  
Covenant terms, minimum percentage of aggregate consolidated net income (or loss)       25.00%            
Line of Credit [Member] | Revolving Credit Facility [Member] | Wilbur L. Ross [Member]                    
Debt Instrument [Line Items]                    
Interest rate, as a percentage of Federal short-term or mid-term interest rate               100.00%    
Notes Payable 5.60 Percent [Member] | Notes Payable, Other Payables [Member] | AGMH [Member]                    
Debt Instrument [Line Items]                    
Interest rate of debt (as a percent)       5.60%     5.60%      
6.25% Notes [Member] | Notes Payable, Other Payables [Member] | AGMH [Member]                    
Debt Instrument [Line Items]                    
Interest rate of debt (as a percent)       6.25%     6.25%      
QUIBS 6.875 Percent [Member] | Corporate securities [Member] | AGMH [Member]                    
Debt Instrument [Line Items]                    
Interest rate of debt (as a percent)       6.875%     6.875%      
Senior Notes 7.0 Percent [Member] | Senior Notes [Member] | AGUS [Member]                    
Debt Instrument [Line Items]                    
Interest rate of debt (as a percent)       7.00%     7.00%      
Senior Notes 5.0 Percent [Member] | Senior Notes [Member] | AGUS [Member]                    
Debt Instrument [Line Items]                    
Interest rate of debt (as a percent)       5.00%     5.00%      
Intercompany Credit Facility [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] | Wilbur L. Ross [Member] | AGL [Member]                    
Debt Instrument [Line Items]                    
Related party, maximum borrowing capacity               $ 225,000,000    
Structured Finance [Member] | Financial Guarantee [Member] | AGM [Member]                    
Debt Instrument [Line Items]                    
Possible liquidity claims, gross exposure       $ 1,200,000,000            
Dexia Credit Local (NY) [Member] | Line of Credit [Member] | Strip Coverage Facility [Member] | AGM [Member]                    
Debt Instrument [Line Items]                    
Commitment amount         $ 495,000,000       $ 1,000,000,000  
Radian [Member] | AGUS [Member]                    
Debt Instrument [Line Items]                    
Intercompany debt $ 200,000,000                  
Municipal Assurance Corp [Member] | AGUS [Member]                    
Debt Instrument [Line Items]                    
Intercompany debt           $ 90,000,000