XML 36 R21.htm IDEA: XBRL DOCUMENT v3.6.0.2

Areas of Operation	12 Months Ended
	Dec. 31, 2016
Areas of Operation
Areas of Operation	15.         Areas of Operation The U.S. and Canada are the only countries of operation for the Company. Revenues for the year ended December 31, 2016 were $133,330,000 with $122,522,000 earned in the U.S. and $10,808,000 earned in Canada. Revenues for the year ended December 31, 2015 were $234,685,000 with $222,154,000 earned in the U.S. and $12,531,000 earned in Canada. Revenues for the three months ended December 31, 2014 were $50,802,000, all earned in the U.S. Revenues for the year ended September 30, 2014 were $261,683,000 with $256,110,000 earned in the U.S. and $5,573,000 earned in Canada. Net long-lived assets as of December 31, 2016 were approximately $110,917,000, with $105,059,000 located in the U.S. and $5,858,000 located in Canada. Net long-lived assets as of December 31, 2015 were approximately $147,567,000, with $136,758,000 located in the U.S. and $10,809,000 located in Canada.

X

- Definition

Disclosure about revenues from external customers (1) attributed to the entity's country of domicile and (2) attributed to all foreign countries in total from which the entity derives revenues and the long-lived assets (except financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets) that are (1) located in the entity's country of domicile, and (2) located in all foreign countries in which the entity holds assets.

+ References

No definition available.

+ Details

Name:	dwsn_DisclosureOnGeographicAreasDescriptionOfRevenueFromExternalCustomersAndLongLivedAssets
Namespace Prefix:	dwsn_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_SegmentsGeographicalAreasAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration