Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Management fee — related party	$ 21,080	$ 29,367	$ 38,173
Investment in money market or mutual funds managed by affiliates of a related party	357,134	148,011
Proceeds from sale of mortgage-backed and credit risk transfer securities	$ 16,273,956	25,028,464	3,311,884
Management
Related Party Transaction [Line Items]
Fee paid by company to manager as percentage of company's shareholders' equity	1.50%
Termination fee multiplier	3
Termination fees assessment period	24 months
Invesco Advisers, Inc. \| Affiliated Entity
Related Party Transaction [Line Items]
Management fee — related party	$ 1,100	1,100	$ 917
Investment in money market or mutual funds managed by affiliates of a related party		1,900
Invesco Advisers, Inc. \| Affiliated Entity \| Non-Agency CMBS
Related Party Transaction [Line Items]
Proceeds from sale of mortgage-backed and credit risk transfer securities		40,000
Realized gain		$ 4,100

Percentage of shareholders' equity per annum paid as management fees

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Termination Fee Multiplier

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Termination Fees Assessment Period

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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Amount of realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

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The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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