Maximum Possible Payout to Executive Officer as a Percentage of the Target Award

No definition available.

Name:	drh_MaximumPossiblePayoutToExecutiveOfficerAsPercentageOfTargetAward
Namespace Prefix:	drh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum Possible Units Earned, Percentage of the Target Award if Total Stockholder Return Is Negative

+ References

No definition available.

+ Details

Name:	drh_MaximumPossibleUnitsEarnedPercentageOfTheTargetAwardIfTotalStockholderReturnIsNegative
Namespace Prefix:	drh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of Total Stockholder Return For Payout of Shares

+ References

No definition available.

+ Details

Name:	drh_PercentageOfTotalStockholderReturnForPayoutOfShares
Namespace Prefix:	drh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Arrangement, Performance Period

+ References

No definition available.

+ Details

Name:	drh_ShareBasedCompensationArrangementByShareBasedPaymentArrangementPerformancePeriod
Namespace Prefix:	drh_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Conversion Ratio

+ References

No definition available.

+ Details

Name:	drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardConversionRatio
Namespace Prefix:	drh_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants To Date

+ References

No definition available.

+ Details

Name:	drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsToDate
Namespace Prefix:	drh_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Vested To Date

+ References

No definition available.

+ Details

Name:	drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedToDate
Namespace Prefix:	drh_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Fair Value at Grant Date

+ References

No definition available.

+ Details

Name:	drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsFairValueAtGrantDate
Namespace Prefix:	drh_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Maximum Possible Payout To Executive Officer As Percentage Of The Target Award

+ References

No definition available.

+ Details

Name:	drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumPossiblePayoutToExecutiveOfficerAsPercentageOfTheTargetAward
Namespace Prefix:	drh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Issued or Committed to Issue

+ References

No definition available.

+ Details

Name:	drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesIssuedOrCommittedToIssue
Namespace Prefix:	drh_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Shares Issued Based on Hotel Market Share

+ References

No definition available.

+ Details

Name:	drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfSharesIssuedBasedOnHotelMarketShare
Namespace Prefix:	drh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Shares Issued Based on Total Shareholder Return

+ References

No definition available.

+ Details

Name:	drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfSharesIssuedBasedOnTotalShareholderReturn
Namespace Prefix:	drh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Percentage Of Total Stockholder Return For Payout Of Shares

+ References

No definition available.

+ Details

Name:	drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTotalStockholderReturnForPayoutOfShares
Namespace Prefix:	drh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Share Based Compensation Arrangement by Share Based Payment Award Restricted Stock Awards Expected to Vest After Year Four From Balance Sheet Date

+ References

No definition available.

+ Details

Name:	drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockAwardsExpectedToVestAfterYearFourFromBalanceSheetDate
Namespace Prefix:	drh_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Share Based Compensation Arrangement by Share Based Payment Award Restricted Stock Awards Expected to Vest Four Years From Balance Sheet Date

+ References

No definition available.

+ Details

Name:	drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockAwardsExpectedToVestFourYearsFromBalanceSheetDate
Namespace Prefix:	drh_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Share Based Compensation Arrangement by Share Based Payment Award Restricted Stock Awards Expected to Vest One Year From Balance Sheet Date

+ References

No definition available.

+ Details

Name:	drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockAwardsExpectedToVestOneYearFromBalanceSheetDate
Namespace Prefix:	drh_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Share Based Compensation Arrangement by Share Based Payment Award Restricted Stock Awards Expected to Vest Remainder of Year From Balance Sheet Date

+ References

No definition available.

+ Details

Name:	drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockAwardsExpectedToVestRemainderOfYearFromBalanceSheetDate
Namespace Prefix:	drh_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Share Based Compensation Arrangement by Share Based Payment Award Restricted Stock Awards Expected to Vest Three Years From Balance Sheet Date

+ References

No definition available.

+ Details

Name:	drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockAwardsExpectedToVestThreeYearsFromBalanceSheetDate
Namespace Prefix:	drh_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Share Based Compensation Arrangement by Share Based Payment Award Restricted Stock Awards Expected to Vest Two Years From Balance Sheet Date

+ References

No definition available.

+ Details

Name:	drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockAwardsExpectedToVestTwoYearsFromBalanceSheetDate
Namespace Prefix:	drh_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iv)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Number of shares authorized for issuance under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of vesting of award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_TitleOfIndividualAxis=srt_ExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=drh_LongTermIncentivePlanUnitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=drh_A2016EquityIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=drh_SpecialRetentionAwardsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=drh_ShareBasedPaymentArrangementTrancheFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stock Incentive Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 02, 2021	Mar. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion ratio					1
Unvested restricted common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)					3 years
Number of shares, granted (in shares)					1,177,537
Awards expected to vest in 2021 (in shares)			8,202		8,202
Awards expected to vest in 2022 (in shares)			268,882		268,882
Awards expected to vest in 2023 (in shares)			306,183		306,183
Awards expected to vest in 2024 (in shares)			381,527		381,527
Awards expected to vest in 2025 (in shares)			162,234		162,234
Awards expected to vest in 2026 (in shares)			324,469		324,469
Unrecognized compensation cost			$ 11.0		$ 11.0
Unrecognized compensation expense related to compensation awards, period for recognition (in months)					39 months
Compensation expense			$ 1.0	$ 0.7	$ 2.8	$ 2.0
Shares related to unvested PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)					3 years
Number of shares, granted (in shares)					347,981
Vesting percentage					100.00%
Awards expected to vest in 2021 (in shares)			269,224		269,224
Awards expected to vest in 2022 (in shares)			352,035		352,035
Awards expected to vest in 2023 (in shares)			347,981		347,981
Unrecognized compensation cost			$ 4.5		$ 4.5
Unrecognized compensation expense related to compensation awards, period for recognition (in months)					23 months
Compensation expense			$ 0.8	0.7	$ 2.2	$ 2.0
Performance period (in years)	2 years				3 years
Percentage of target award of maximum possible payout to executives					150.00%
Number of units earned if total stockholder return is negative					100.00%
Fair value at grant date (in dollars per share)	$ 9.28
Volatility	68.80%
Risk-free rate	0.26%
Fair value at grant date based on hotel market share (in dollars per share)	$ 9.40
Shares related to unvested PSUs \| Executive Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted (in shares)	347,981
Total shareholder return					50.00%
Hotel market share					50.00%
Percentage of total stockholder return for payout of shares					30.00%
Maximum possible payout to executive officer as percentage of the target award					150.00%
Shares related to unvested PSUs \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of total stockholder return for payout of shares					30.00%
Shares related to unvested PSUs \| Minimum \| Executive Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of total stockholder return for payout of shares					75.00%
Percentage of total stockholder return for payout of shares					75.00%
Long-Term Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards expected to vest in 2021 (in shares)			108,422		108,422
Awards expected to vest in 2022 (in shares)			26,966		26,966
Unrecognized compensation cost			$ 0.7		$ 0.7
Unrecognized compensation expense related to compensation awards, period for recognition (in months)					14 months
Compensation expense			$ 0.3	$ 0.3	$ 0.8
Units granted (in shares)			325,264		325,264
Units vested (in shares)			189,876		189,876
2016 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option and incentive plan, shares authorized (up to) (in shares)			6,082,664		6,082,664
Number of shares issued or committed to issue (in shares)			4,409,225		4,409,225
Special Retention Awards \| Unvested restricted common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		5 years
Number of shares, granted (in shares)		691,490
Special Retention Awards \| Unvested restricted common stock \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		0.00%
Special Retention Awards \| Unvested restricted common stock \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		25.00%
Special Retention Awards \| Unvested restricted common stock \| Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		25.00%
Special Retention Awards \| Unvested restricted common stock \| Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		50.00%