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Stock Incentive Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 36 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2012 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock, shares issued | 200,711,085us-gaap_CommonStockSharesIssued |  |  | 199,964,041us-gaap_CommonStockSharesIssued
Performance period | 3 years |  |  |
Maximum Possible Payout to Executive Officer as a Percentage of the Target Award (as a percent) | 150.00%drh_MaximumPossiblePayoutToExecutiveOfficerAsPercentageOfTargetAward |  |  |
Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option and Incentive plan, shares authorized | 8,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Number of Shares Issued or Committed to Issue | 3,879,185drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesIssuedOrCommittedToIssue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period | 3 years |  |  |
Awards Expected to Vest One Year from Balance Sheet (in shares) | 241,881drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockAwardsExpectedToVestOneYearFromBalanceSheet / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |
Awards Expected to Vest Two Years from Balance Sheet Date (in shares) | 153,578drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockAwardsExpectedToVestTwoYearsFromBalanceSheetDate / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |
Awards Expected to Vest Three Years from Balance Sheet Date (in shares) | 79,291drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockAwardsExpectedToVestThreeYearsFromBalanceSheetDate / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |
Unrecognized compensation cost (in dollars) | $ 5.8us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |
Unrecognized compensation expense related to compensation awards, period for recognition (in months) | 28 months |  |  |
Compensation expense (in dollars) | 0.7us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |
Number of unvested shares outstanding | 474,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  | 514,419us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Shares vested during period | 255,828us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |
Market Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense (in dollars) | 0.1us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = drh_MarketStockUnitsMember |  |  |
Number of unvested shares outstanding | 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = drh_MarketStockUnitsMember |  |  |
Shares vested during period | 99,047us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = drh_MarketStockUnitsMember |  |  |
Common stock, shares issued | 148,572us-gaap_CommonStockSharesIssued / us-gaap_AwardTypeAxis = drh_MarketStockUnitsMember |  |  |
Performance Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 3 years |
Awards Expected to Vest One Year from Balance Sheet (in shares) | 232,154drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockAwardsExpectedToVestOneYearFromBalanceSheet / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Awards Expected to Vest Two Years from Balance Sheet Date (in shares) | 206,971drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockAwardsExpectedToVestTwoYearsFromBalanceSheetDate / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Awards Expected to Vest Three Years from Balance Sheet Date (in shares) | 218,467drh_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockAwardsExpectedToVestThreeYearsFromBalanceSheetDate / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Unrecognized compensation cost (in dollars) | 4.8us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Unrecognized compensation expense related to compensation awards, period for recognition (in months) | 28 months |  |  |
Compensation expense (in dollars) | $ 0.5us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | $ 0.2us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |
Number of unvested shares outstanding | 657,592us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  | 436,170us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Executive Officers [Member] | Market Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period | 3 years |  |  |

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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 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 Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + 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 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 number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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