Business Acquisitions - Additional Information (Details)				3 Months Ended								12 Months Ended
	Nov. 30, 2020 USD ($) shares	Feb. 05, 2020 USD ($) Tranche	Apr. 01, 2019 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2021 USD ($)	Nov. 30, 2020 $ / shares	Mar. 04, 2020 USD ($)
Business Acquisition [Line Items]
Ownership percentage				100.00%								100.00%
Net sales				$ 350,370,000	$ 309,459,000	$ 288,669,000	$ 280,717,000	$ 301,157,000	$ 323,674,000	$ 322,006,000	$ 302,293,000	$ 1,229,215,000	$ 1,249,130,000	$ 1,213,989,000
Net income (loss) attributable to common stockholders				$ 29,735,000	$ 27,152,000	$ 21,033,000	$ 20,168,000	$ 47,190,000	$ 38,060,000	$ 36,284,000	$ 31,716,000	98,088,000	153,250,000	104,021,000
Additional interest expense included in unaudited proforma consolidated results												11,662,000	7,893,000	9,901,000
Reduction income tax expense benefit included in unaudited proforma consolidated results												$ 21,112,000	$ 44,131,000	$ 44,556,000
Lite On Semiconductor
Business Acquisition [Line Items]
Acquisition date	Nov. 30, 2020
Ownership percentage																100.00%
Business acquisition shares repurchased | shares	7,765,778
Business acquisition shares repurchased percentage	15.00%
Business acquisition, share price | $ / shares																$ 42.50
Business acquisition, shares acquired | shares	307,371,139
Purchase price	$ 453,400,000
Business combination separately recognized transactions, gain or loss on settlement of accounts payables	0
Business combination separately recognized transactions, gain or loss on settlement of accounts receivables	0
Business acquisition, pro forma information, description												The unaudited pro forma consolidated results of operations do not purport to be indicative of the results that would have been obtained if the above acquisition had actually occurred as of the dates indicated or of those results that may be obtained in the future. The unaudited proforma consolidated results for year ended December 31, 2020, include adjustments that result in a reduction to amortization and depreciation of $5.5 million, removal of sales to Diodes on the books of LSC and related cost of goods sold of $12.4 million and $7.9 million, respectively, removal of LSC’s share of Diodes’ profits as a 15% shareholder of $13.1 million, removal of $2.4 million of transaction costs, additional interest expense of $6.0 million, removal of impairment charges of $6.3 million, removal of operations of On-Bright, and a tax impact of those adjustments of a reduction to tax expense of $18.6 million.	The unaudited proforma consolidated results for year ended December 31, 2019, include adjustments that result in a reduction to amortization and depreciation of $8.8 million, removal of sales to Diodes on the books of LSC and related COGS of $13.7 million and $9.0 million, respectively, removal of LSC’s share of Diodes’ profits as a 15% shareholder of $23.4 million, removal of $1.0 million of transaction costs, additional interest expense of $11.1 million, removal of impairment charges of $0.3 million, removal of the operation of On-Bright, and a tax impact of those adjustments of a reduction to tax expense of $10.7 million. These unaudited pro forma consolidated results of operations were derived, in part, from the historical consolidated financial statements of LSC and other available information and assumptions believed to be reasonable under the circumstances.  LSC will be conformed to Diodes’ reporting calendar.
Adjustments in reduction to amortization included in unaudited proforma consolidated results												$ 5,500,000	$ 8,800,000
Adjustments in removal of sales included in unaudited proforma consolidated results												12,400,000	13,700,000
Adjustments in cost of goods sold included in unaudited proforma consolidated results												$ 7,900,000	$ 9,000,000.0
Adjustments in sales removal profit percentage included in unaudited proforma consolidated results												15.00%	15.00%
Adjustments in sales removal profit amount included in unaudited proforma consolidated results												$ 13,100,000	$ 23,400,000
Adjustments in removal of transaction costs included in unaudited proforma consolidated results												2,400,000	1,000,000.0
Adjustments in removal of impairment charges included in unaudited proforma consolidated results												6,300,000	300,000
Additional interest expense included in unaudited proforma consolidated results												6,000,000.0	11,100,000
Reduction income tax expense benefit included in unaudited proforma consolidated results												18,600,000	$ 10,700,000
Total consideration paid	453,400,000
Lite On Semiconductor | Net Sales
Business Acquisition [Line Items]
Net sales												16,900,000
Lite On Semiconductor | Net Income (Loss) Attributable to Common Stockholders
Business Acquisition [Line Items]
Net income (loss) attributable to common stockholders												$ 1,600,000
Lite On Semiconductor | Selling, General and Administrative
Business Acquisition [Line Items]
Acquisition costs	$ 3,500,000
Savitech Corporation (“Savitech”)
Business Acquisition [Line Items]
Business acquisition, date of acquisition agreement		Feb. 05, 2020
Agreement amount to be invested		$ 14,200,000
Ownership percentage																	33.60%
Number of tranche investment | Tranche		2
Total consideration paid		$ 13,900,000
Savitech Corporation (“Savitech”) | Minimum
Business Acquisition [Line Items]
Ownership percentage		51.00%
Savitech Corporation (“Savitech”) | Forecast | Minimum
Business Acquisition [Line Items]
Ownership percentage															51.00%
Savitech Corporation (“Savitech”) | Forecast | Maximum
Business Acquisition [Line Items]
Investment amount															$ 8,600,000
Savitech Corporation (“Savitech”) | Tranche One
Business Acquisition [Line Items]
Investment amount																	$ 5,600,000
Savitech Corporation (“Savitech”) | Tranche Two | Forecast | Minimum
Business Acquisition [Line Items]
Ownership percentage															51.00%
Savitech Corporation (“Savitech”) | Tranche Two | Forecast | Maximum
Business Acquisition [Line Items]
Investment amount															$ 8,500,000
Savitech Corporation (“Savitech”) | Selling, General and Administrative
Business Acquisition [Line Items]
Acquisition costs		$ 100,000
Wafer Fabrication Facility ("GFAB")
Business Acquisition [Line Items]
Acquisition date			Apr. 01, 2019
Total consideration paid			$ 33,200,000
Wafer Fabrication Facility ("GFAB") | Selling, General and Administrative
Business Acquisition [Line Items]
Acquisition costs			$ 600,000