Warehouse and Other Secured Lines of Credit - Summary of Line of Credit (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Line of Credit Facility [Line Items]
Outstanding amount	$ 200,000,000	$ 750,000,000
Warehouse Line of Credit
Line of Credit Facility [Line Items]
Outstanding amount	6,681,917,000	4,902,090,000
Current aggregate committed amount	750,000,000
Warehouse Line of Credit \| Line of Credit Due May 17, 2024
Line of Credit Facility [Line Items]
Maximum borrowing capacity	500,000,000
Outstanding amount	495,494,000	489,117,000
Warehouse Line of Credit \| Line Of Credit Due August 29, 2023
Line of Credit Facility [Line Items]
Maximum borrowing capacity	1,000,000,000.0
Outstanding amount	667,436,000	791,760,000
Warehouse Line of Credit \| Line of Credit Due November 5, 2024
Line of Credit Facility [Line Items]
Maximum borrowing capacity	200,000,000
Outstanding amount	134,726,000	75,691,000
Warehouse Line of Credit \| Line of Credit Due December 19, 2024
Line of Credit Facility [Line Items]
Maximum borrowing capacity	300,000,000
Outstanding amount	298,965,000	271,179,000
Warehouse Line of Credit \| Line of Credit Due January 6, 2025
Line of Credit Facility [Line Items]
Maximum borrowing capacity	1,000,000,000.0
Outstanding amount	581,289,000	175,604,000
Warehouse Line of Credit \| Line of Credit Due February 19, 2025
Line of Credit Facility [Line Items]
Maximum borrowing capacity	2,500,000,000
Outstanding amount	1,699,090,000	1,252,169,000
Warehouse Line of Credit \| Line Of Credit Due February 20, 2025
Line of Credit Facility [Line Items]
Maximum borrowing capacity	500,000,000
Outstanding amount	375,601,000	213,556,000
Warehouse Line of Credit \| Line of Credit Due April 23, 2024
Line of Credit Facility [Line Items]
Maximum borrowing capacity	250,000,000
Outstanding amount	220,407,000	103,729,000
Warehouse Line of Credit \| Line of Credit Due November 28, 2025
Line of Credit Facility [Line Items]
Maximum borrowing capacity	3,000,000,000.0
Outstanding amount	2,173,445,000	1,475,368,000
Warehouse Line of Credit \| Line of Credit, ASAP program
Line of Credit Facility [Line Items]
Maximum borrowing capacity	600,000,000
Outstanding amount	0	0
Warehouse Line of Credit \| Line of Credit, EF
Line of Credit Facility [Line Items]
Maximum borrowing capacity	750,000,000
Outstanding amount	$ 35,464,000	$ 53,917,000

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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