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

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- Definition Investment Income, Interest, Contractual + References No definition available. + Details
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- Details
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- 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 + Details
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- 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 + Details
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