Derivative Financial Instruments - Summary of Outstanding Foreign Currency Forward Contracts (Details) - Foreign Currency Forward Contracts - Balance Sheet Hedges - Non-designated	3 Months Ended	12 Months Ended
Mar. 31, 2020 USD ($) € / £ € / $ £ / $ $ / ¥ $ / ¥ $ / $	Dec. 31, 2019 USD ($) € / £ € / $ £ / $ $ / ¥ $ / ¥ $ / $
Derivative [Line Items]
Notional Amount	$ 99,929,000	$ 105,900,000
Derivative One
Derivative [Line Items]
Notional Amount	$ 2,961,000	$ 1,844,000
Effective Date	Mar. 31, 2020	Dec. 31, 2019
Maturity Date	May 31, 2020	Feb. 29, 2020
Index	EUR/GBP	EUR/GBP
Weighted Average Foreign Exchange Rate \| € / £	0.8848	0.8471
Derivative Two
Derivative [Line Items]
Notional Amount	$ 4,009,000	$ 3,375,000
Effective Date	Mar. 31, 2020	Dec. 31, 2019
Maturity Date	May 31, 2020	Feb. 29, 2020
Index	EUR/USD	EUR/USD
Weighted Average Foreign Exchange Rate \| € / $	1.1009	1.123
Derivative Three
Derivative [Line Items]
Notional Amount	$ 10,445,000	$ 25,957,000
Effective Date	Mar. 31, 2020	Dec. 31, 2019
Maturity Date	May 31, 2020	Feb. 29, 2020
Index	GBP/USD	GBP/USD
Weighted Average Foreign Exchange Rate \| £ / $	1.2453	1.3257
Derivative Four
Derivative [Line Items]
Notional Amount	$ 37,850,000	$ 39,340,000
Effective Date	Mar. 31, 2020	Dec. 31, 2019
Maturity Date	May 31, 2020	Feb. 29, 2020
Index	USD/CNY	USD/CNY
Weighted Average Foreign Exchange Rate \| $ / ¥	7.1036	6.9762
Derivative Five
Derivative [Line Items]
Notional Amount	$ 1,136,000	$ 763,000
Effective Date	Mar. 31, 2020	Dec. 31, 2019
Maturity Date	May 31, 2020	Feb. 29, 2020
Index	USD/JPY	USD/JPY
Weighted Average Foreign Exchange Rate \| $ / ¥	107.2520	108.732
Derivative Six
Derivative [Line Items]
Notional Amount	$ 42,028,000	$ 33,621,000
Effective Date	Mar. 31, 2020	Dec. 31, 2019
Maturity Date	May 31, 2020	Feb. 29, 2020
Index	USD/TWD	USD/TWD
Weighted Average Foreign Exchange Rate \| $ / $	29.9560	20.988
Derivative Seven
Derivative [Line Items]
Notional Amount	$ 500,000	$ 500,000
Effective Date	Jan. 31, 2020	Jan. 31, 2019
Maturity Date	Jul. 31, 2020	Jan. 31, 2020
Index	USD/TWD	USD/TWD
Weighted Average Foreign Exchange Rate \| $ / $	30	30.635
Derivative Eight
Derivative [Line Items]
Notional Amount	$ 500,000	$ 500,000
Effective Date	Jan. 31, 2020	Oct. 31, 2019
Maturity Date	Jan. 31, 2021	Feb. 29, 2020
Index	USD/TWD	USD/TWD
Weighted Average Foreign Exchange Rate \| $ / $	29.976	30.571
Derivative Nine
Derivative [Line Items]
Notional Amount	$ 500,000
Effective Date	Mar. 31, 2020
Maturity Date	May 31, 2020
Index	USD/TWD
Weighted Average Foreign Exchange Rate \| $ / $	30.355

Derivative effective dates.

No definition available.

Name:	diod_DerivativeEffectiveDates
Namespace Prefix:	diod_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The average strike price on a group of foreign currency option contracts such as put options or call options.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAverageForeignCurrencyOptionStrikePrice
Namespace Prefix:	us-gaap_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeMaturityDates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Reference to the index or unit of measurement for the underlying which establishes the pricing terms of the derivative instrument. For example, the basis on the underlying for a natural gas futures contract might be the NYMEX price per million British thermal units (MMBtu).

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=diod_BalanceSheetHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=diod_DerivativeOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=diod_DerivativeTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=diod_DerivativeThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=diod_DerivativeFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=diod_DerivativeFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=diod_DerivativeSixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=diod_DerivativeSevenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=diod_DerivativeEightMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=diod_DerivativeNineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: