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Business Acquisitions - Narrative (Details) |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
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Mar. 19, 2015 USD ($) | Jul. 14, 2014 USD ($) shares | Jan. 31, 2014 USD ($) | Sep. 23, 2013 USD ($) shares | Apr. 12, 2013 USD ($) | Apr. 01, 2013 USD ($) | Mar. 31, 2013 USD ($) | Mar. 29, 2013 USD ($) subsidiary | Feb. 15, 2013 USD ($) loan | Dec. 31, 2012 USD ($) | Dec. 27, 2012 USD ($) loan $ / shares | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) shares | Dec. 31, 2012 USD ($) | Jan. 30, 2014 | Mar. 30, 2013 | Sep. 01, 2011 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period from acquisition date that initial allocation of purchase price is subject to change |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 2,343,929,000 | $ 764,824,000 |  |  |
Purchase price settled in cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | $ 2,289,709,000 | 603,724,000 |  |  |
Preferred stock, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62,000 |  |  |  |
Common stock converted (in shares) | shares |  |  |  | 3,145,640 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees for professional services related to acquisition |  |  |  |  |  |  |  |  |  |  |  | $ 62,428,000 | $ 160,704,000 | $ 191,728,000 | $ 212,745,000 | 326,667,000 | $ 123,886,000 | 29,213,000 |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | 420,201,000 |  |  |  |
ResCap [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired in connection with purchase of trade or business, amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |
Business acquisition date |  |  |  |  |  |  |  |  | Feb. 15, 2013 |  |  |  |  |  |  |  |  |  |  |  |
Capital deployed to finance acquisition |  |  |  |  |  |  |  |  | $ 840,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Additional borrowing |  |  |  |  |  |  |  |  | $ 1,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of new servicing advance facilities | loan |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Number of existing facility | loan |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Fees for professional services related to acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,200,000 |  |  |  |
Total consideration for acquisition |  |  |  |  |  |  |  |  | $ 2,343,929,000 |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 211,419,000 |  |  |  |  |  |  |  |  |  |  |  |
Homeward Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition date |  |  |  |  |  |  |  |  |  |  | Dec. 27, 2012 |  |  |  |  |  |  |  |  |  |
Unpaid principal balance assets acquired |  |  |  |  |  |  |  |  |  |  | $ 77,000,000,000 |  |  |  |  |  |  |  |  |  |
Residential mortgage loans | loan |  |  |  |  |  |  |  |  |  |  | 421,000 |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  | $ 765,700,000 |  |  |  |  |  |  |  |  |  |
Purchase price settled in cash |  |  |  |  |  |  |  |  |  |  | 603,700,000 |  |  |  |  |  |  |  |  |  |
Purchase price, settled with preferred shares |  |  |  |  |  |  |  |  |  |  | 162,000,000 |  |  |  |  |  |  |  |  |  |
Common stock converted (in shares) | shares |  | 1,950,296 |  | 3,145,640 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for repurchase of equity |  | $ 72,300,000 |  | $ 157,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Losses expected to be indemnified through retained liabilities claims, receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 28,800,000 | $ 13,600,000 |  |  |  |
Fees for professional services related to acquisition |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Total consideration for acquisition |  |  |  |  |  |  |  |  |  |  | 764,824,000 |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  |  |  | 79,511,000 |  |  |  |  |  |  |  |  |  |
Reverse mortgage acquired |  |  |  |  |  |  |  |  |  | $ 558,700,000 |  |  |  |  |  |  |  | $ 558,700,000 |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | $ 345,936,000 |  |  |  |  |  |  |  |  |  |
Correspondent One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% |
Acquired net assets |  |  |  |  |  |  | $ 26,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  | 23,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage loans |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized loss |  |  |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liberty Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition date |  |  |  |  |  | Apr. 01, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unpaid principal balance assets acquired |  |  |  |  |  | $ 55,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price settled in cash |  |  |  |  |  | 22,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired net assets |  |  |  |  |  | 31,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  | 4,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage loans |  |  |  |  |  | 11,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of existing outstanding debt |  |  |  |  |  | 9,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse mortgage acquired |  |  |  |  |  | 60,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans held for investment |  |  |  |  |  | 10,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts due under warehouse facilities |  |  |  |  |  | 46,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HMBS related borrowings |  |  |  |  |  | 10,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ocwen Structured Investments, LLC (OSI) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price settled in cash |  |  | $ 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  | 87.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26.00% |  |
Acquired net assets |  |  | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  | $ 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of assets acquired and liabilities assumed at fair value recognized |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest acquired |  |  | 12.65% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage servicing rights |  |  | $ 9,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  |  | $ 7,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Servicing Rights [Member] | ResCap [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unpaid principal balance assets acquired |  |  |  |  |  |  |  |  | 44,900,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price settled in cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 174,600,000 |  |  |  |  |
Mortgage Servicing Rights [Member] | Conventional Government Insured And Non Agency Residential Forward Mortgage Loans [Member] | ResCap [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unpaid principal balance assets acquired |  |  |  |  |  |  |  |  | 111,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Subservice Mortgage Servicing Rights [Member] | ResCap [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unpaid principal balance assets acquired |  |  |  |  |  |  |  |  | 27,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Term Loan [Member] | ResCap [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  | $ 1,300,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Altisource [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of businesses |  |  |  |  | $ 128,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derecognition of goodwill in connection with the sale of a business |  |  |  |  | $ 128,800,000 |  |  | $ 81,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of subsidiaries sold | subsidiary |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables and other assets |  |  |  |  |  |  |  | $ 9,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities assumed |  |  |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Altisource [Member] | Homeward Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75,000,000
Altisource [Member] | Correspondent One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% |
Total consideration for acquisition |  |  |  |  |  |  | 12,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Homeward Residential Holdings, Inc. [Member] | Altisource [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of businesses |  |  |  |  |  |  |  | 87,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale business, net |  |  |  |  |  |  |  | $ 82,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Series A Preferred Stock [Member] | Homeward Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  |  |  |  |  |  |  | 3.75% |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 31.79 |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares |  | 62,000 |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Barclays Bank PLC [Member] | Homeward Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000
Maximum [Member] | Homeward Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Losses expected to be indemnified through retained liabilities claims, receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000.0 |  |  |  |  |
Subsequent Event [Member] | Homeward Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of indemnification claims | $ 38,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
National Mortgage Settlement [Member] | Homeward Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Losses expected to be indemnified through retained liabilities claims, receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000,000 |  |  |  |  |
Unrelated Party [Member] | Correspondent One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration for acquisition |  |  |  |  |  |  | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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