Derivative Financial Instruments - Summary of Outstanding Foreign Currency Forward Contracts (Details) - Foreign Currency Forward Contracts	12 Months Ended
Dec. 31, 2018 USD ($) € / £ € / $ £ / $ $ / ¥ $ / ¥ $ / $	Dec. 31, 2017 USD ($) $ / $
Derivative [Line Items]
Notional Amount	$ 122,400,000	$ 87,600,000
Derivative One \| Cash Flow Hedges \| Non-designated
Derivative [Line Items]
Notional Amount	$ 1,221,000	$ 2,494,000
Effective Date	Dec. 31, 2018	Dec. 31, 2017
Maturity Date	Feb. 28, 2019	Jan. 31, 2018
Index	EUR/GPB	EUR/GPB
Weighted Average Strike Rate	0.8981	1.2009
Derivative Two \| Cash Flow Hedges \| Non-designated
Derivative [Line Items]
Notional Amount	$ 12,538,000	$ 10,514,000
Effective Date	Dec. 31, 2018	Dec. 31, 2017
Maturity Date	Feb. 28, 2019	Jan. 31, 2018
Index	EUR/USD	EUR/USD
Weighted Average Strike Rate	1.1479	1.2009
Derivative Three \| Cash Flow Hedges \| Non-designated
Derivative [Line Items]
Notional Amount	$ 8,463,000	$ 10,612,000
Effective Date	Dec. 31, 2018	Dec. 31, 2017
Maturity Date	Feb. 28, 2019	Jan. 31, 2018
Index	GPB/USD	GPB/USD
Weighted Average Strike Rate	1.2785	1.3541
Derivative Four \| Cash Flow Hedges \| Non-designated
Derivative [Line Items]
Notional Amount	$ 44,946,000	$ 31,834,000
Effective Date	Dec. 31, 2018	Dec. 31, 2017
Maturity Date	Feb. 28, 2019	Jan. 31, 2018
Index	USD/CNY	USD/CNY
Weighted Average Strike Rate	6.8738	6.5343
Derivative Five \| Cash Flow Hedges \| Non-designated
Derivative [Line Items]
Notional Amount	$ 844,000	$ 1,594,000
Effective Date	Dec. 31, 2018	Dec. 31, 2017
Maturity Date	Feb. 28, 2019	Jan. 31, 2018
Index	USD/JPY	USD/JPY
Weighted Average Strike Rate	110.14	112.35
Derivative Six \| Cash Flow Hedges \| Non-designated
Derivative [Line Items]
Notional Amount	$ 54,041,000	$ 30,594,000
Effective Date	Dec. 31, 2018	Dec. 31, 2017
Maturity Date	Feb. 28, 2019	Jan. 31, 2018
Index	USD/TWD	USD/TWD
Weighted Average Strike Rate \| $ / $	30.559	29.406
Derivative Seven \| Cash Flow Hedges \| Non-designated
Derivative [Line Items]
Notional Amount	$ 300,000
Effective Date	Dec. 31, 2018
Maturity Date	Jan. 31, 2019
Index	USD/TWD
Weighted Average Strike Rate \| $ / $	30.669

Derivative effective dates.

No definition available.

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

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- 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:	us-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

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_FinancialInstrumentAxis=diod_DerivativeOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
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_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: