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Note Receivable - Schedule of Investment Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortization of discount	$ 1,075us-gaap_InvestmentIncomeAmortizationOfDiscount	$ 2,602us-gaap_InvestmentIncomeAmortizationOfDiscount	$ 0us-gaap_InvestmentIncomeAmortizationOfDiscount
Total interest income	3,027us-gaap_InvestmentIncomeInterest	6,328us-gaap_InvestmentIncomeInterest	305us-gaap_InvestmentIncomeInterest
Mortgage Receivable [Member] | Allerton Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual interest income	1,317drh_InvestmentIncomeInterestContractual / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_MortgageReceivablesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = drh_NewAllertonLoansMember	3,456drh_InvestmentIncomeInterestContractual / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_MortgageReceivablesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = drh_NewAllertonLoansMember
Amortization of discount	1,075us-gaap_InvestmentIncomeAmortizationOfDiscount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_MortgageReceivablesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = drh_NewAllertonLoansMember	2,602us-gaap_InvestmentIncomeAmortizationOfDiscount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_MortgageReceivablesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = drh_NewAllertonLoansMember
Total interest income	$ 2,392us-gaap_InvestmentIncomeInterest / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_MortgageReceivablesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = drh_NewAllertonLoansMember	$ 6,058us-gaap_InvestmentIncomeInterest / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_MortgageReceivablesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = drh_NewAllertonLoansMember

X

- Definition

Investment Income, Interest, Contractual

+ References

No definition available.

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Balance Type:	na
Period Type:	duration

X

- Definition

Amount of accretion of purchase discount on nonoperating securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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X

- Definition

Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.7(b))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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