XML 112 R98.htm IDEA: XBRL DOCUMENT
v3.22.1

Restricted Net Assets - Additional Information (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2021
Restricted Asset Disclosure [Abstract] |
Statutory accounting practices, statutory capital and surplus rate on after tax profits | 10.00%

X
- Definition Restricted Asset Disclosure. + References No definition available. + Details
Name: | ddl_RestrictedAssetDisclosureAbstract
Namespace Prefix: | ddl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Statutory accounting practices, statutory capital and surplus rate on after tax profits. + References No definition available. + Details
Name: | ddl_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRateOnAfterTaxProfits
Namespace Prefix: | ddl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration