Amount of general liability insurance coverage.

Name:	drq_AmountOfGeneralLiabilityInsuranceCoverage
Namespace Prefix:	drq
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of interest, penalties and monetary restatement fees on tax assessment.

+ Details

Name:	drq_AmountOfInterestPenaltiesAndMonetaryRestatementFeesOnTaxAssessment
Namespace Prefix:	drq
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Assessment value of subsidiary.

+ Details

Name:	drq_AssessmentValueOfSubsidiary
Namespace Prefix:	drq
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of lawsuits.

+ Details

Name:	drq_NumberOfLawsuits
Namespace Prefix:	drq
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of other lawsuits.

+ Details

Name:	drq_NumberOfOtherLawsuits
Namespace Prefix:	drq
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Revenue percentage.

+ Details

Name:	drq_RevenuePercentage
Namespace Prefix:	drq
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Service revenue percentage.

+ Details

Name:	drq_ServiceRevenuePercentage
Namespace Prefix:	drq
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Present value of the estimated aggregate accrual for damages arising from third-party use of the entity's product(s) or process(es) as of the balance sheet date (if the accrual qualifies for discounting).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section Y
-Paragraph Question 1

+ Details

Name:	us-gaap_LossContingencyAccrualProductLiabilityNet
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The total amount of pending claims pertaining to a loss contingency accrual as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12

+ Details

Name:	us-gaap_LossContingencyPendingClaimsNumber
Namespace Prefix:	us-gaap
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Commitments And Contingencies (Narrative) (Details) In Millions, unless otherwise specified	1 Months Ended		3 Months Ended	6 Months Ended				3 Months Ended		6 Months Ended		12 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 31, 2011 BRL	Dec. 31, 2010 BRL	Jun. 30, 2010	Jun. 30, 2011 USD ($)	Jun. 30, 2011 BRL	Jul. 21, 2011	Apr. 22, 2010 USD ($)	Jun. 30, 2011 Gulf Of Mexico Revenue [Member]	Jun. 30, 2010 Gulf Of Mexico Revenue [Member]	Jun. 30, 2011 Gulf Of Mexico Revenue [Member]	Jun. 30, 2010 Gulf Of Mexico Revenue [Member]	Dec. 31, 2010 Gulf Of Mexico Revenue [Member]	Jun. 30, 2011 Service Revenue [Member]	Jun. 30, 2010 Service Revenue [Member]	Jun. 30, 2011 Service Revenue [Member]	Jun. 30, 2010 Service Revenue [Member]	Dec. 31, 2010 Service Revenue [Member]
Revenues			42.00%					22.00%	43.00%	30.00%	43.00%	39.00%
Service revenue percentage													5.00%	5.00%	4.00%	6.00%	5.00%
Number of class action lawsuits				9	9
Number of other lawsuits				10	10
Number of claims made						100
General liability coverage							$ 100
Indemnification obligation				5
Assessment value of subsidiary	24.4	24.4		15.6
Amount of interest, penalties and monetary restatement fees on tax assessment				$ 16.2	25.3