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Earnings (Loss) Per Share - Calculation of EPS (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Income (loss) from continuing operations					$ 6,828us-gaap_IncomeLossFromContinuingOperations	$ 7,679us-gaap_IncomeLossFromContinuingOperations	$ 14,120us-gaap_IncomeLossFromContinuingOperations	$ (4,799)us-gaap_IncomeLossFromContinuingOperations	$ 163,377us-gaap_IncomeLossFromContinuingOperations	$ 23,828us-gaap_IncomeLossFromContinuingOperations	$ (18,075)us-gaap_IncomeLossFromContinuingOperations
Income from discontinued operations, net of income taxes					22,727us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	885us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	952us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	673us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	25,237us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	1,483us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income (loss)	$ 63,616us-gaap_NetIncomeLoss	$ 43,808us-gaap_NetIncomeLoss	$ 51,916us-gaap_NetIncomeLoss	$ 4,037us-gaap_NetIncomeLoss	$ 29,555us-gaap_NetIncomeLoss	$ 8,564us-gaap_NetIncomeLoss	$ 15,072us-gaap_NetIncomeLoss	$ (4,126)us-gaap_NetIncomeLoss	$ 163,377us-gaap_NetIncomeLoss	$ 49,065us-gaap_NetIncomeLoss	$ (16,592)us-gaap_NetIncomeLoss
Denominator:
Weighted-average number of common shares outstanding—basic									195,943,813us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	195,478,353us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	180,826,124us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities:
Unvested restricted common stock									181,310drh_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsUnvestedRestrictedCommonStock	177,314drh_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsUnvestedRestrictedCommonStock	0drh_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsUnvestedRestrictedCommonStock
Shares related to unvested MSUs and PSUs									556,763drh_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsSharesRelatedtoUnvestedMarketStockUnitsandPerformanceStockUnits	206,839drh_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsSharesRelatedtoUnvestedMarketStockUnitsandPerformanceStockUnits	0drh_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsSharesRelatedtoUnvestedMarketStockUnitsandPerformanceStockUnits
Unexercised stock appreciation rights									1,095drh_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsUnexercisedStockAppreciationRights	0drh_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsUnexercisedStockAppreciationRights	0drh_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsUnexercisedStockAppreciationRights
Weighted-average number of common shares outstanding—diluted									196,682,981us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	195,862,506us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	180,826,124us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings (loss) per share:
Continuing operations (in dollars per share)									$ 0.83us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.12us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ (0.10)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued operations (in dollars per share)									$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ 0.13us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Total (in dollars per share)	$ 0.32us-gaap_EarningsPerShareBasic	$ 0.22us-gaap_EarningsPerShareBasic	$ 0.27us-gaap_EarningsPerShareBasic	$ 0.02us-gaap_EarningsPerShareBasic					$ 0.83us-gaap_EarningsPerShareBasic	$ 0.25us-gaap_EarningsPerShareBasic	$ (0.09)us-gaap_EarningsPerShareBasic
Diluted earnings (loss) earnings per share:
Continuing operations (in dollars per share)									$ 0.83us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.12us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ (0.10)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued operations (in dollars per share)									$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ 0.13us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Total (in dollars per share)	$ 0.32us-gaap_EarningsPerShareDiluted	$ 0.22us-gaap_EarningsPerShareDiluted	$ 0.26us-gaap_EarningsPerShareDiluted	$ 0.02us-gaap_EarningsPerShareDiluted					$ 0.83us-gaap_EarningsPerShareDiluted	$ 0.25us-gaap_EarningsPerShareDiluted	$ (0.09)us-gaap_EarningsPerShareDiluted

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

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