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Stock Incentive Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share based payment, vesting period (years) | 3 years |  |  |
Weighted-average grant date fair value, Granted (in dollars per share) | $ 12.39 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 9.33 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 9.84 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
Unvested shares outstanding | 514,419 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 583,021 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 676,111 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 1,010,127 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Summary of Stock Appreciation Rights and Dividend Equivalent Rights |  |  |  |
Expected to vest one year from balance sheet date | 255,828 drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockAwardsExpectedToVestOneYearFromBalanceSheet / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |
Expected to vest two years from balance sheet date | 169,826 drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockAwardsExpectedToVestTwoYearsFromBalanceSheetDate / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |
Expected to vest three years from balance sheet date | 81,523 drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockAwardsExpectedToVestThreeYearsFromBalanceSheetDate / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |
Expected to vest four years from balance sheet date | 7,242 drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockAwardsExpectedToVestFourYearsFromBalanceSheetDate / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |
Unrecognized compensation cost (in dollars) | $ 3.4 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |
Unrecognized compensation expense related to compensation awards, period for recognition (in months) | 23 months |  |  |
Compensation expense (in dollars) | 3.2 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 3.4 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 3.3 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
Restricted Stock [Member] | President and Chief Operating Officer [Member] |  |  |  |
Summary of Stock Appreciation Rights and Dividend Equivalent Rights |  |  |  |
Accelerated vesting expense | 0.3 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = drh_PresidentandChiefOperatingOfficerMember | 0.7 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = drh_PresidentandChiefOperatingOfficerMember |  |
Market Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share based payment, vesting period (years) | 3 years |  |  |
Unvested shares outstanding | 98,381 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |
Summary of Stock Appreciation Rights and Dividend Equivalent Rights |  |  |  |
Unrecognized compensation cost (in dollars) | 0.1 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |
Unrecognized compensation expense related to compensation awards, period for recognition (in months) | 2 months |  |  |
Compensation expense (in dollars) | 0.3 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 0.8 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 0.9 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
Market Stock Units [Member] | President and Chief Operating Officer [Member] |  |  |  |
Summary of Stock Appreciation Rights and Dividend Equivalent Rights |  |  |  |
Accelerated vesting expense |  | 0.2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = drh_PresidentandChiefOperatingOfficerMember |  |
Performance Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share based payment, vesting period (years) | 3 years |  |  |
Weighted-average grant date fair value, Granted (in dollars per share) | $ 12.33 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | $ 9.64 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |
Unvested shares outstanding | 436,170,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 223,176,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |
Summary of Stock Appreciation Rights and Dividend Equivalent Rights |  |  |  |
Expected to vest two years from balance sheet date | 230,592 drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockAwardsExpectedToVestTwoYearsFromBalanceSheetDate / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Expected to vest three years from balance sheet date | 205,578 drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockAwardsExpectedToVestThreeYearsFromBalanceSheetDate / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Unrecognized compensation cost (in dollars) | 2.6 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Unrecognized compensation expense related to compensation awards, period for recognition (in months) | 22 months |  |  |
Compensation expense (in dollars) | $ 1.4 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | $ 0.6 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |
Stock Incentive Plans (Textuals) [Abstract] |  |  |  |
Performance period | 3 years |  |  |
Maximum Possible Payout to Executive Officer as a Percentage of the Target Award (as a percent) | 150.00%drh_MaximumPossiblePayoutToExecutiveOfficerAsPercentageOfTargetAward / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Performance Stock Units [Member] | March 2013 Award [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average grant date fair value, Granted (in dollars per share) | $ 9.55 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardDateAxis = drh_March2013AwardMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |
Volatility | 39.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardDateAxis = drh_March2013AwardMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Risk-Free Rate | 0.36%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardDateAxis = drh_March2013AwardMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Performance Stock Units [Member] | May 2013 Award [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average grant date fair value, Granted (in dollars per share) | $ 10.41 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardDateAxis = drh_May2013AwardMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |
Volatility | 37.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardDateAxis = drh_May2013AwardMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Risk-Free Rate | 0.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardDateAxis = drh_May2013AwardMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Performance Stock Units [Member] | March 2014 Award [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average grant date fair value, Granted (in dollars per share) | $ 12.77 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardDateAxis = drh_March2014AwardMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |
Volatility | 33.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardDateAxis = drh_March2014AwardMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Risk-Free Rate | 0.66%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardDateAxis = drh_March2014AwardMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Performance Stock Units [Member] | May 2014 Award [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average grant date fair value, Granted (in dollars per share) | $ 9.88 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardDateAxis = drh_May2014AwardMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |
Volatility | 33.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardDateAxis = drh_May2014AwardMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Risk-Free Rate | 0.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardDateAxis = drh_May2014AwardMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option and Incentive plan, shares authorized | 8,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = drh_StockOptionAndIncentivePlan2004Member |  |  |
Number of Shares Issued or Committed to Issue | 3,695,750 drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesIssuedOrCommittedToIssue / us-gaap_PlanNameAxis = drh_StockOptionAndIncentivePlan2004Member |  |  |

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- Definition Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Issued or Committed to Issue + References No definition available. + Details
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- 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
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- Definition Share Based Compensation Arrangement by Share Based Payment Award Restricted Stock Awards Expected to Vest One Year from Balance Sheet + References No definition available. + Details
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- 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
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- 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
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- 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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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