Discontinued Operations and Assets Held for Sale - Schedule Of Results From Discontinued Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating expenses:
Income (loss) from discontinued operations, net of tax	$ 287,906	$ (1,413)
Discontinued Operations [Member]
Revenues:
Total revenues	228,845	271,524
Cost of sales:
Total cost of sales	156,985	207,310
Gross profit	71,860	64,214
Operating expenses:
Selling, general and administrative expenses	14,797	24,042
Research and development expenses	19,484	30,332
Restructuring and other charges	15,873	9,142
Total operating expenses	50,154	63,516
Operating income from discontinued operations	21,706	698
Foreign currency gain, net	1,277	503
Others, net	72	(67)
Income from discontinued operations before income tax expense	23,055	1,134
Income tax expense	11,452	2,547
Gain on sale of discontinued operations	287,117
Transaction costs	(10,814)
Income (loss) from discontinued operations, net of tax	287,906	(1,413)
Foundry Services Group [Member] | Discontinued Operations [Member]
Revenues:
Total revenues	254,732	307,348
Cost of sales:
Total cost of sales	182,872	243,134
Fab Three Foundry Services [Member] | Discontinued Operations [Member]
Revenues:
Total revenues	(25,887)	(35,824)
Cost of sales:
Total cost of sales	$ (25,887)	$ (35,824)