CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income (loss)	$ (842,279)us-gaap_ProfitLoss	$ 3,729,698us-gaap_ProfitLoss	$ 1,735,900us-gaap_ProfitLoss
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Amortization of Investment Securities premiums and discounts, net	664,379	973,968	1,470,801
Amortization of commercial real estate investment premiums and discounts, net	616	(238)
Amortization of intangibles	1,390us-gaap_AmortizationOfIntangibleAssets	2,614us-gaap_AmortizationOfIntangibleAssets	4,080us-gaap_AmortizationOfIntangibleAssets
Amortization of deferred financing costs	9,951us-gaap_AmortizationOfFinancingCosts	8,152us-gaap_AmortizationOfFinancingCosts	6,965us-gaap_AmortizationOfFinancingCosts
Amortization of net origination fees and costs, net	(4,917)
Amortization of contingent beneficial conversion feature and equity component of Convertible Senior Notes	37,341	17,101	18,017
Depreciation expense	3,205us-gaap_Depreciation
Net gain on sale of commercial real estate	(2,748)us-gaap_GainLossOnSaleOfProperties
Net (gains) losses on sales of Agency mortgage-backed securities and debentures	(94,476)us-gaap_GainLossOnSaleOfInvestments	(424,086)us-gaap_GainLossOnSaleOfInvestments	(432,139)us-gaap_GainLossOnSaleOfInvestments
Net loss on extinguishment of 4% Convertible Senior Notes			162,340
Stock compensation expense	1,072	2,547	5,584
Impairment of goodwill		23,987us-gaap_GoodwillImpairmentLoss
Loss on previously held equity interest in CreXus		18,896
Non-cash component of disposal of subsidiary			(1,177)
Realized loss on disposal of subsidiary		21,041
Unrealized (gains) losses on interest rate swaps	948,755us-gaap_UnrealizedGainLossOnDerivatives	(2,002,200)us-gaap_UnrealizedGainLossOnDerivatives	32,219us-gaap_UnrealizedGainLossOnDerivatives
Net unrealized (gains) losses on interest-only Agency mortgage-backed securities	86,172	(244,730)	59,937
Net (gains) losses on trading assets	245,495	(1,509)	(20,525)
Proceeds from repurchase agreements of RCap	881,680,774	1,453,216,892	733,739,097
Payments on repurchase agreements of RCap	(875,782,907)	(1,471,279,777)	(727,275,192)
Proceeds from reverse repurchase agreements	107,898,578	450,898,777	402,606,536
Payments on reverse repurchase agreements	(107,898,578)	(449,187,682)	(403,556,765)
Proceeds from securities borrowed	23,888,955nly_ProceedsFromSecuritiesBorrowed	263,155,068nly_ProceedsFromSecuritiesBorrowed	74,361,498nly_ProceedsFromSecuritiesBorrowed
Payments on securities borrowed	(21,306,062)nly_PaymentsOnSecuritiesBorrowed	(263,577,019)nly_PaymentsOnSecuritiesBorrowed	(75,593,708)nly_PaymentsOnSecuritiesBorrowed
Proceeds from securities loaned	41,939,298nly_ProceedsFromSecuritiesLoaned	484,836,546nly_ProceedsFromSecuritiesLoaned	185,657,591nly_ProceedsFromSecuritiesLoaned
Payments on securities loaned	(44,466,966)nly_PaymentsOnSecuritiesLoaned	(484,117,193)nly_PaymentsOnSecuritiesLoaned	(184,654,177)nly_PaymentsOnSecuritiesLoaned
Proceeds from U.S. Treasury securities	3,159,253nly_ProceedsFromDebtInvestments	142,054,631nly_ProceedsFromDebtInvestments	64,028,348nly_ProceedsFromDebtInvestments
Payments on U.S. Treasury securities	(3,920,425)nly_PaymentsOnDebtInvestments	(141,019,615)nly_PaymentsOnDebtInvestments	(64,746,420)nly_PaymentsOnDebtInvestments
Net payments on derivatives	(134,284)	(133,023)	(10,173)
Net change in:
Due to / from brokers	8,596	503
Other assets	(2,657)	3,897	(9,243)
Accrued interest and dividends receivable	(21,376)	141,207	(6,151)
Receivable for investment advisory income	(3,563)	10,891	1,820
Receivable from prime broker			3,272
Accrued interest payable	34,889	(25,975)	47,931
Accounts payable and other liabilities	987	3,909	3,241
Net cash provided by (used in) operating activities	6,128,468	(12,892,722)	7,639,507
Cash flows from investing activities:
Payments on purchases of Agency mortgage-backed securities and debentures	(38,626,689)	(39,071,377)	(86,161,777)
Proceeds from sales of Agency mortgage-backed securities and debentures	22,654,547	54,328,560	30,542,875
Principal payments on Agency mortgage-backed securities	8,312,784	21,748,131	35,133,544
Proceeds from Agency debentures called		2,147,205nly_AgencyDebenturesCalled	1,801,283nly_AgencyDebenturesCalled
Payments on purchases of corporate debt	(136,953)nly_PaymentsToAcquireCorporateDebt	(82,502)nly_PaymentsToAcquireCorporateDebt	(81,090)nly_PaymentsToAcquireCorporateDebt
Proceeds from corporate debt called		24,252nly_ProceedsFromCorporateDebtCalled	67,649nly_ProceedsFromCorporateDebtCalled
Principal payments on corporate debt	88,909	4,716	4,247
Acquisition of CreXus		(724,889)
Origination of commercial real estate investments, net	(246,833)	(984,743)
Proceeds from sales of commercial real estate held for sale	26,019us-gaap_ProceedsFromSaleOfRealEstate	20,192us-gaap_ProceedsFromSaleOfRealEstate
Principal payments on commercial real estate investments	316,082	114,999
Purchase of investments in real estate	(190,743)
Earn out payment			(13,387)nly_PaymentsOfEarnOutObligations
Proceeds from derivatives		7,465	10,379
Proceeds from sales of equity securities			4,048
Payment on disposal of subsidiary		16,209nly_PaymentOnDisposalOfSubsidiary	(800)nly_PaymentOnDisposalOfSubsidiary
Net cash provided by (used in) investing activities	(7,802,877)	37,548,218	(18,693,029)
Cash flows from financing activities:
Proceeds from repurchase agreements	195,370,377nly_ProceedsFromRepurchaseAgreements	381,641,327nly_ProceedsFromRepurchaseAgreements	352,497,651nly_ProceedsFromRepurchaseAgreements
Principal payments on repurchase agreements	(191,687,319)	(404,583,138)	(340,273,744)
Proceeds from issuance of securitized debt	260,700
Payment of deferred financing cost	(6,382)us-gaap_PaymentsOfFinancingCosts
Proceeds from exercise of stock options		2,204	8,438
Net proceeds from issuance of 5% Convertible Senior Notes offering			727,500us-gaap_ProceedsFromConvertibleDebt
Net payment on extinguishment of 4% Convertible Senior Notes			(617,476)us-gaap_RepaymentsOfConvertibleDebt
Net proceeds from direct purchases and dividend reinvestments	2,370	2,855	2,794
Net (payments) proceeds from follow-on offerings			(248)
Proceeds from mortgages payable	127,325
Principal payments on participation sold	(309)nly_PaymentsOnStructuredDebtFinancing	(200)nly_PaymentsOnStructuredDebtFinancing
Principal payments on mortgages payable	(47)us-gaap_RepaymentsOfOtherLongTermDebt
Contributions from noncontrolling interests	5,486
Net payment on share repurchase		(141,149)	(255,901)
Dividends paid	(1,208,984)us-gaap_PaymentsOfDividends	(1,640,748)us-gaap_PaymentsOfDividends	(2,149,872)us-gaap_PaymentsOfDividends
Net cash provided by (used in) financing activities	2,863,217	(24,718,849)	10,675,113
Net (decrease) increase in cash and cash equivalents	1,188,808	(63,353)	(378,409)
Cash and cash equivalents, beginning of period	552,436	615,789	994,198
Cash and cash equivalents, end of period	1,741,244	552,436	615,789
Supplemental disclosure of cash flow information:
Interest received	3,307,238nly_InterestReceived	4,035,661nly_InterestReceived	4,718,524nly_InterestReceived
Dividends received	25,189nly_DividendsReceived	21,624nly_DividendsReceived	29,522nly_DividendsReceived
Investment advisory income received	27,780nly_FeesReceived	54,534nly_FeesReceived	84,483nly_FeesReceived
Interest paid (excluding interest paid on interest rate swaps)	496,033	656,648	595,152
Net interest paid on interest rate swaps	812,108	885,234	892,656
Taxes paid	8,314us-gaap_IncomeTaxesPaidNet	10,447us-gaap_IncomeTaxesPaidNet	52,590us-gaap_IncomeTaxesPaidNet
Noncash investing activities:
Receivable for investments sold	1,010,094	1,193,730	290,722
Payable for investments purchased	264,984	764,131	8,256,957
Net change in unrealized gains (losses) on available-for-sale securities, net of reclassification adjustment	2,953,816	(5,802,175)	44,254
Noncash financing activities:
Dividends declared, not yet paid	284,293	284,230	432,154
Conversion of Series B cumulative preferred stock			32,272
Contingent beneficial conversion feature on 4% Convertible Senior Notes	17,308	17,383	61,725
Equity component of 5% Convertible Senior Notes			11,717
7.625% Series C Cumulative Redeemable Preferred Stock
Cash flows from financing activities:
Net proceeds from Series C Preferred offering			290,514
7.50% Series D Cumulative Redeemable Preferred Stock
Cash flows from financing activities:
Net proceeds from Series C Preferred offering			$ 445,457

Amount of accretion (amortization) of purchase discount (premium) on commercial real estate investments.

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Dividends received during the current period.

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Increase Decrease In Receivable From Prime Broker

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Loss On Previously Held Equity Interest In Affiliates

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The net change amount in unrealized (loss) gain on available-for-sale securities and interest rate swaps, net of reclassification adjustment.

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Net proceeds associated with subsequent offering of equity.

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Amount of non cash components of disposal of subsidiary.

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The amount payable for Agency Mortgage-Backed Securities, Agency debentures and corporate debt.

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Payment on disposal of subsidiary.

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The cash outflow or inflow for derivative instruments during the period, which are classified as operating activities, excluding those designated as hedging instruments.

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Payment made subsequent to business combination upon achieving of certain criteria outlined in the agreement.

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The amount of payments associated with securities borrowed from broker dealers or institutions.

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The amount of payments associated with securities loaned to other broker dealers.

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The cash outflow to acquire corporate debt.

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Proceeds from corporate debt called.

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The amount of proceeds from debt securities.

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The cash outflow for the purchase of fixed income or other debt securities issued by a corporation or other issuer not elsewhere specified in the taxonomy.

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The cash inflow from collection of principal from borrowers on mortgage backed securities held.

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The amount of proceeds from repurchase agreements.

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The amount of proceeds from repurchase agreements from broker dealer.

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The cash inflow associated with the sale of investments in common stocks and other forms of securities that provide ownership interests in a corporation.

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The amount of proceeds from securities borrowed from broker dealers or institutions.

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The amount of proceeds from securities loaned to other broker dealers.

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The amount receivable for Agency Mortgage-Backed Securities, Agency debentures and corporate debt.

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Unrealized gain (loss) included in earnings for interest only securitized, pay-through debt securities collateralized by real estate mortgage loans (mortgages).

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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The cash outflow from the acquisition of property as primarily intended to generate income for its owner.

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Cash received for the sale of real estate that is not part of an investing activity during the current period.

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The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

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The cash inflow associated with agreements to purchase and then resell securities to counterparties (reverse repurchase agreements).

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No definition available.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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The cash outflow attributable to repayments of borrowings not otherwise defined in the taxonomy (with maturities initially due after one year or beyond the operating cycle if longer).

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The gross value of stock issued during the period upon the conversion of convertible securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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