Impairments and Other Charges - Narrative (Details) $ in Millions	Sep. 30, 2017 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Impairments and other charges related to inventory	$ 33.6
Impairments and other charges related to fixed assets	$ 27.4

Impairments and Other Charges Related to Fixed Assets

No definition available.

Name:	drq_ImpairmentsandOtherChargesRelatedtoFixedAssets
Namespace Prefix:	drq_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant