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

No definition available.

Name:	drh_MaximumPossiblePayoutToExecutiveOfficerAsPercentageOfTargetAward
Namespace Prefix:	drh_
Data Type:	num: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:	num: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:	num: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, Fair Value Assumptions, Fair Value at Grant Date

+ References

No definition available.

+ Details

Name:	drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsFairValueAtGrantDate
Namespace Prefix:	drh_
Data Type:	num:perShareItemType
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:	num: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:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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=115993241&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

+ 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

+ 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

+ Details

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

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
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

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Namespace Prefix:	us-gaap_
Data Type:	num: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

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num: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 equity instruments other than options outstanding, including both vested and non-vested instruments.

+ 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)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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

+ Details

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

- Definition

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

+ References

+ 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:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

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

- 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:	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:	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:

Stock Incentive Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	Feb. 25, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Executive Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shareholder return				50.00%
Hotel market share				50.00%
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				3 years
Awards expected to vest in 2020 (in shares)		8,202		8,202
Awards expected to vest in 2021 (in shares)		247,019		247,019
Awards expected to vest in 2022 (in shares)		141,836		141,836
Awards expected to vest in 2023 (in shares)		176,005		176,005
Unrecognized compensation cost		$ 4.6		$ 4.6
Unrecognized compensation expense related to compensation awards, period for recognition (in months)				27 months
Compensation expense		$ 0.6	$ 0.6	$ 1.3	$ 1.4
Number of shares, granted (in shares)				343,410
Units vested (in shares)				229,664
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				3 years
Awards expected to vest in 2021 (in shares)		290,927		290,927
Awards expected to vest in 2022 (in shares)		269,224		269,224
Awards expected to vest in 2023 (in shares)		352,035		352,035
Unrecognized compensation cost		$ 4.8		$ 4.8
Unrecognized compensation expense related to compensation awards, period for recognition (in months)				26 months
Compensation expense		$ 0.7	0.7	$ 1.4	1.3
Performance period (in 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%
Number of shares, granted (in shares)				352,035
Fair value at grant date (in dollars per share)	$ 8.52
Volatility	21.40%
Risk-free rate	1.16%
Fair value at grant date based on hotel market share (in dollars per share)	$ 9.58
Units vested (in shares)				245,937
Performance Stock Units \| Executive Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted (in shares)	352,035
Long-Term Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards expected to vest in 2021 (in shares)		108,421		108,421
Awards expected to vest in 2022 (in shares)		108,422		108,422
Awards expected to vest in 2023 (in shares)		26,966		26,966
Unrecognized compensation cost		$ 2.1		$ 2.1
Unrecognized compensation expense related to compensation awards, period for recognition (in months)				24 months
Compensation expense		$ 0.3	$ 0.2	$ 0.5	$ 0.3
Number of shares, granted (in shares)				80,898
Units outstanding (in shares)		325,264		325,264
Units vested (in shares)				81,455
Long-Term Incentive Plan Unit \| Executive Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted (in shares)	80,898
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)		3,053,153		3,053,153
Maximum \| Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of total stockholder return for payout of shares				30.00%
Minimum \| Performance Stock Units \| Executive Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of total stockholder return for payout of shares				75.00%