XML 24 R95.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2

Earnings Per Share - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019 shares
Earnings Per Share [Abstract]
Minimum percentage of class A common stock declared dividend excess over class B dividend	10.00%
Options excluded from diluted earnings per share	5,531,561

X

- Definition

Minimum percentage of excess class A common stock dividend over class B dividend.

+ References

No definition available.

+ Details

Name:	dgica_MinimumPercentageOfExcessClassACommonStockDividendOverClassBDividend
Namespace Prefix:	dgica_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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