Residential Loans at Fair Value - Additional Information (Detail) $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($)
Receivables [Abstract]
Percentage threshold for state concentrations of residential loans	5.00%
Average holding period from date of borrowing for purchased and originated mortgage loans	20 days
Repurchased loans held	$ 3.8

The amount of mortgage loans that have been repurchased by the Company and are recorded as an asset on the balance sheet.

No definition available.

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