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Mortgage Loans Payable (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mortgage Loans on Real Estate [Line Items]    
Mortgage Carrying Value $ 146,670us-gaap_DebtInstrumentCarryingAmount $ 146,553us-gaap_DebtInstrumentCarryingAmount
Mortgage Principal 146,361us-gaap_DebtInstrumentFaceAmount 146,430us-gaap_DebtInstrumentFaceAmount
Joint Venture [Member]    
Mortgage Loans on Real Estate [Line Items]    
Mortgage Carrying Value 104,079us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nly_JointVentureMember
103,950us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nly_JointVentureMember
Mortgage Principal 103,950us-gaap_DebtInstrumentFaceAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nly_JointVentureMember
103,950us-gaap_DebtInstrumentFaceAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nly_JointVentureMember
Interest rate 4.03%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nly_JointVentureMember
4.03%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nly_JointVentureMember
Fixed/Floating Rate Fixed  
Maturity Date Dec. 06, 2024 Dec. 06, 2024
Priority First liens  
Three Thousand One Hundred South Mall [Member]    
Mortgage Loans on Real Estate [Line Items]    
Mortgage Carrying Value 12,365us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_RealEstatePropertiesAxis
= nly_SouthMallMember
12,350us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_RealEstatePropertiesAxis
= nly_SouthMallMember
Mortgage Principal 12,350us-gaap_DebtInstrumentFaceAmount
/ us-gaap_RealEstatePropertiesAxis
= nly_SouthMallMember
12,350us-gaap_DebtInstrumentFaceAmount
/ us-gaap_RealEstatePropertiesAxis
= nly_SouthMallMember
Interest rate 4.01%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RealEstatePropertiesAxis
= nly_SouthMallMember
4.01%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RealEstatePropertiesAxis
= nly_SouthMallMember
Fixed/Floating Rate Fixed  
Maturity Date Jun. 06, 2019 Jun. 06, 2019
Priority First liens  
Twelve Thousand One Hundred Fifty-One Jefferson [Member]    
Mortgage Loans on Real Estate [Line Items]    
Mortgage Carrying Value 11,074us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_RealEstatePropertiesAxis
= nly_JeffersonMember
11,025us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_RealEstatePropertiesAxis
= nly_JeffersonMember
Mortgage Principal 11,025us-gaap_DebtInstrumentFaceAmount
/ us-gaap_RealEstatePropertiesAxis
= nly_JeffersonMember
11,025us-gaap_DebtInstrumentFaceAmount
/ us-gaap_RealEstatePropertiesAxis
= nly_JeffersonMember
Interest rate 3.58%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RealEstatePropertiesAxis
= nly_JeffersonMember
3.58%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RealEstatePropertiesAxis
= nly_JeffersonMember
Fixed/Floating Rate Fixed  
Maturity Date Sep. 06, 2019 Sep. 06, 2019
Priority First liens  
ARIZONA    
Mortgage Loans on Real Estate [Line Items]    
Mortgage Carrying Value 16,649us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementGeographicalAxis
= stpr_AZ
16,709us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementGeographicalAxis
= stpr_AZ
Mortgage Principal 16,548us-gaap_DebtInstrumentFaceAmount
/ us-gaap_StatementGeographicalAxis
= stpr_AZ
16,600us-gaap_DebtInstrumentFaceAmount
/ us-gaap_StatementGeographicalAxis
= stpr_AZ
Interest rate 3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_StatementGeographicalAxis
= stpr_AZ
3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_StatementGeographicalAxis
= stpr_AZ
Fixed/Floating Rate Fixed  
Maturity Date Jan. 01, 2017 Jan. 01, 2017
Priority First liens  
NEVADA    
Mortgage Loans on Real Estate [Line Items]    
Mortgage Carrying Value 2,503us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementGeographicalAxis
= stpr_NV
2,519us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementGeographicalAxis
= stpr_NV
Mortgage Principal $ 2,488us-gaap_DebtInstrumentFaceAmount
/ us-gaap_StatementGeographicalAxis
= stpr_NV
$ 2,505us-gaap_DebtInstrumentFaceAmount
/ us-gaap_StatementGeographicalAxis
= stpr_NV
Interest rate 3.45%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_StatementGeographicalAxis
= stpr_NV
3.45%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_StatementGeographicalAxis
= stpr_NV
Fixed/Floating Rate Floating [1]  
Maturity Date Mar. 29, 2017 Mar. 29, 2017
Priority First liens  
[1] Rate is fixed via an interest rate swap (pay fixed 3.45%, receive floating rate of L+200).