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Summary of Gross Amounts, Amounts Offset and net Amounts of Repurchase Agreement and Reverse Repurchase Agreement (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Repurchase Agreements:    
Gross amounts -reverse repurchase agreements $ 1,700,000nly_SecuritiesForReverseRepurchaseAgreementsGrossAmounts $ 700,000nly_SecuritiesForReverseRepurchaseAgreementsGrossAmounts
Amounts offset - reverse repurchase agreement (1,600,000)nly_SecuritiesForReverseRepurchaseAgreementsAmountsOffset (600,000)nly_SecuritiesForReverseRepurchaseAgreementsAmountsOffset
Netted amounts -reverse repurchase 100,000us-gaap_SecuritiesForReverseRepurchaseAgreements 100,000us-gaap_SecuritiesForReverseRepurchaseAgreements [1]
Gross amounts -repurchase agreement 62,077,378nly_SecuritiesSoldUnderAgreementsToRepurchaseGrossAmounts 71,961,926nly_SecuritiesSoldUnderAgreementsToRepurchaseGrossAmounts
Amounts offset -repurchase agreement (1,600,000)nly_SecuritiesSoldUnderAgreementsToRepurchaseAmountsOffset (600,000)nly_SecuritiesSoldUnderAgreementsToRepurchaseAmountsOffset
Netted amounts -repurchase agreement $ 60,477,378us-gaap_SecuritiesSoldUnderAgreementsToRepurchase $ 71,361,926us-gaap_SecuritiesSoldUnderAgreementsToRepurchase [1]
[1] Derived from the audited consolidated financial statements at December 31, 2014.