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(Debt, Schedule of Ratio of Net Indebtedness) (Details) | 12 Months Ended
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Dec. 31, 2011
Line Of Credit Facility Leverage Range [Line Items] |
Percent Of Unused Portion Line Of Credit Facility Trigerring Lower Commitment Fee Percentage | 50.00%
Less than 4.00 to 1.00 [Member] |
Summary of leverage and applicable margin |
Line Of Credit Facility Applicable Margin Rate | 2.25%
Greater than or equal to 4.00 to 1.00 but less than 5.00 to 1.00 [Member] |
Summary of leverage and applicable margin |
Line Of Credit Facility Applicable Margin Rate | 2.50%
Greater than or equal to 5.00 to 1.00 but less than 5.50 to 1.00 [Member] |
Summary of leverage and applicable margin |
Line Of Credit Facility Applicable Margin Rate | 2.75%
Greater than or equal to 5.50 to 1.00 but less than 6.00 to 1.00 [Member] |
Summary of leverage and applicable margin |
Line Of Credit Facility Applicable Margin Rate | 3.00%
Greater than or equal to 6.00 to 1.00 [Member] |
Summary of leverage and applicable margin |
Line Of Credit Facility Applicable Margin Rate | 3.25%
Minimum [Member] |
Line Of Credit Facility Leverage Range [Line Items] |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.40%
Minimum [Member] | Greater than or equal to 4.00 to 1.00 but less than 5.00 to 1.00 [Member] |
Summary of leverage and applicable margin |
Ratio Of Net Indebtedness to Ebitda | 4
Minimum [Member] | Greater than or equal to 5.00 to 1.00 but less than 5.50 to 1.00 [Member] |
Summary of leverage and applicable margin |
Ratio Of Net Indebtedness to Ebitda | 5
Minimum [Member] | Greater than or equal to 5.50 to 1.00 but less than 6.00 to 1.00 [Member] |
Summary of leverage and applicable margin |
Ratio Of Net Indebtedness to Ebitda | 5.5
Minimum [Member] | Greater than or equal to 6.00 to 1.00 [Member] |
Summary of leverage and applicable margin |
Ratio Of Net Indebtedness to Ebitda | 6
Maximum [Member] |
Line Of Credit Facility Leverage Range [Line Items] |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.30%
Maximum [Member] | Less than 4.00 to 1.00 [Member] |
Summary of leverage and applicable margin |
Ratio Of Net Indebtedness to Ebitda | 4
Maximum [Member] | Greater than or equal to 4.00 to 1.00 but less than 5.00 to 1.00 [Member] |
Summary of leverage and applicable margin |
Ratio Of Net Indebtedness to Ebitda | 5
Maximum [Member] | Greater than or equal to 5.00 to 1.00 but less than 5.50 to 1.00 [Member] |
Summary of leverage and applicable margin |
Ratio Of Net Indebtedness to Ebitda | 5.5
Maximum [Member] | Greater than or equal to 5.50 to 1.00 but less than 6.00 to 1.00 [Member] |
Summary of leverage and applicable margin |
Ratio Of Net Indebtedness to Ebitda | 6

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- Details
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Namespace Prefix: | drh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Period Type: | duration

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- Definition Line of credit facility applicable margin rate. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Percent Of Unused Portion Line Of Credit Facility Trigerring Commitment Fee Percentage + References No definition available. + Details
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Namespace Prefix: | drh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Ratio Of Net Indebtedness to Ebitda + References No definition available. + Details
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Namespace Prefix: | drh_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration