Amount of reduction in corporate debt expected to result from restructuring.

No definition available.

Name:	dhcp_CorporateDebtReductionExpectedFromRestructuring
Namespace Prefix:	dhcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Forbearance Period

+ References

No definition available.

+ Details

Name:	dhcp_ForbearancePeriod
Namespace Prefix:	dhcp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum trading capacity under the hedging facility without consideration of any current restrictions on the amount that could be traded or the amounts currently outstanding under the facility.

+ References

No definition available.

+ Details

Name:	dhcp_HedgingFacilityMaximumTradingCapacity
Namespace Prefix:	dhcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage Of Consenting Term Lenders To Restructuring Agreement

+ References

No definition available.

+ Details

Name:	dhcp_PercentageOfConsentingTermLendersToRestructuringAgreement
Namespace Prefix:	dhcp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of New Common Stock to be issued to Noteholders of the Term Loans.

+ References

No definition available.

+ Details

Name:	dhcp_PercentageOfNewCommonStockToBeIssuedToNoteholders
Namespace Prefix:	dhcp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of Noteholders party to the forbearance agreements.

+ References

No definition available.

+ Details

Name:	dhcp_PercentageOfNoteholdersToForbearanceAgreements
Namespace Prefix:	dhcp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_WarehouseAgreementBorrowingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dhcp_DebtorinPossessionWarehouseFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dhcp_BorrowingsToFundPurchaseOrOriginationOfResidentialLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dhcp_BorrowingsToFundRepurchaseOfHECMsAndRealEstateOwnedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dhcp_DebtorInPossessionAdvanceFinancingFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorSubordinatedNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events - Additional Information (Detail) - USD ($)	Feb. 14, 2019	Feb. 11, 2019	Feb. 08, 2019	Dec. 31, 2018	Jan. 16, 2019	Feb. 09, 2018
Subsequent Event [Member]
Subsequent Event [Line Items]
Percentage of Consenting Term Lenders to Restructuring Agreement		75.00%
Expected reduction to corporate debt from recapitalization		$ 800,000,000
Trading capacity for hedging facility	$ 1,900,000,000
Forbearance period			125 days
Warehouse Agreement Borrowings [Member] \| Debtor-in-Possession Warehouse Facility [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Available financing	1,900,000,000
Warehouse Agreement Borrowings [Member] \| Borrowings to Fund Purchase or Origination of Residential Loans [Member]
Subsequent Event [Line Items]
Available financing				$ 1,000,000,000
Interest rate spread				2.25%
Warehouse Agreement Borrowings [Member] \| Borrowings to Fund Purchase or Origination of Residential Loans [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Available financing	$ 650,000,000
Variable interest rate basis	3-month LIBOR
Interest rate spread	2.25%
Warehouse Agreement Borrowings [Member] \| Borrowings to Fund Repurchase of HECMs and Real Estate Owned [Member]
Subsequent Event [Line Items]
Available financing				$ 800,000,000
Interest rate spread				3.25%
Warehouse Agreement Borrowings [Member] \| Borrowings to Fund Repurchase of HECMs and Real Estate Owned [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Available financing	$ 1,000,000,000
Variable interest rate basis	3-month LIBOR
Interest rate spread	3.25%
Secured Debt [Member] \| Debtor-In-Possession Advance Financing Facility [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Available financing	$ 250,000,000
Variable interest rate basis	3-month LIBOR
Interest rate spread	2.25%
Second Lien Notes [Member]
Subsequent Event [Line Items]
Aggregate principal amount						$ 250,000,000.0
Second Lien Notes [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Percentage of Noteholders to forbearance agreements					75.00%
2018 Credit Agreement [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Percentage of Noteholders to forbearance agreements			50.00%		50.00%
Forecast [Member]
Subsequent Event [Line Items]
Percentage of New Common Stock to be issued to Noteholders		100.00%
Forecast [Member] \| 2018 Credit Agreement [Member]
Subsequent Event [Line Items]
Aggregate principal amount		$ 400,000,000