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Stockholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Stockholders' Equity [Abstract]    
Common stock, par value (in dollars per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized (in shares) 200,000,000us-gaap_CommonStockSharesAuthorized 200,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (in shares) 46,410,000us-gaap_CommonStockSharesIssued 46,410,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding (in shares) 40,738,000us-gaap_CommonStockSharesOutstanding 41,176,000us-gaap_CommonStockSharesOutstanding
Preferred stock, par value (in dollars per share) $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized (in shares) 50,000,000us-gaap_PreferredStockSharesAuthorized 50,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued (in shares) 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding (in shares) 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Changes in the outstanding shares of Common Stock [Roll Forward]    
Common stock outstanding at beginning of year (in shares) 41,176,000us-gaap_CommonStockSharesOutstanding 43,284,000us-gaap_CommonStockSharesOutstanding
Common stock repurchased for treasury (in shares) (438,000)abcp_CommonStockSharesRepurchasedForTreasury (2,108,000)abcp_CommonStockSharesRepurchasedForTreasury
Issuance of treasury stock (in shares) 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Common stock outstanding at end of year (in shares) 40,738,000us-gaap_CommonStockSharesOutstanding 41,176,000us-gaap_CommonStockSharesOutstanding
Changes in the treasury shares of Common Stock [Abstract]    
Treasury stock held at beginning of period (in shares) 5,234,000us-gaap_TreasuryStockShares 3,126,000us-gaap_TreasuryStockShares
Common stock repurchased for treasury (in shares) 438,000abcp_CommonStockSharesRepurchasedForTreasury 2,108,000abcp_CommonStockSharesRepurchasedForTreasury
Issuance of treasury stock (in shares) 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Treasury stock held at end of period (in shares) 5,672,000us-gaap_TreasuryStockShares 5,234,000us-gaap_TreasuryStockShares
Common Stock Repurchase Plan [Abstract]    
Common shares repurchased to treasury during period (in shares) 438,000abcp_CommonStockSharesRepurchasedForTreasury 2,108,000abcp_CommonStockSharesRepurchasedForTreasury
Aggregate cost of shares repurchased during period $ 525abcp_AggregateCostOfSharesRepurchasedDuringPeriod $ 2,475abcp_AggregateCostOfSharesRepurchasedDuringPeriod
Total number of common shares authorized for repurchase (in shares) 10,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased  
Total number of common shares repurchased (in shares) 6,226,000us-gaap_TreasuryStockSharesAcquired  
Total number of common shares that may still be repurchased (in shares) 3,774,000us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased  
Common stock reserved for issuance under Company's stock option and other employee benefit plans [Abstract]    
1993 Srock Incentive Plan 4,320,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized  
Other employee benefit plan 110,000us-gaap_DeferredCompensationArrangementWithIndividualSharesAuthorizedForIssuance  
Common shares reserved for issuance (in shares) 4,430,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance  
Stockholder Rights Plan [Abstract]    
Dividends declared, number of right per common share 1abcp_DividendsDeclaredNumberOfRightPerCommonShare  
Exercise price of rights (in dollars per share) $ 75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights  
Minimum percentage of outstanding common shares to be acquired (in hundredths) 25.00%abcp_MinimumPercentageOfOutstandingCommonSharesToBeAcquired  
Minimum percentage of outstanding common shares for tender offer (in hundredths) 20.00%abcp_MinimumPercentageOfOutstandingCommonSharesForTenderOffer  
Redemption price of rights (in dollars per share) $ 0.05abcp_RedemptionPriceOfRights  
Minimum percentage of common shares by a single acquirer or group (in hundredths) 20.00%abcp_MinimumPercentageOfCommonSharesBySingleAcquirerOrGroup  
Period after accumulation of minimum percentage of common shares to invoke redemption of rights 10 days