Discontinued Operations and Assets Held for Sale - Schedule Of Results From Discontinued Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating Expenses [Abstract]
Selling, general and administrative expenses	$ 12,888	$ 10,686	$ 37,398	$ 33,817
Research and development expenses	12,477	10,233	34,094	34,049
Total operating expenses	25,365	20,919	72,046	67,866
Foreign currency gain (loss), net	8,864	(21,985)	(13,638)	(44,166)
Income (loss) from discontinued operations, net of tax	264,501	12,637	289,227	(963)
Discontinued Operations [Member]
Revenues:
Total revenues	66,397	80,510	228,845	194,883
Cost of sales:
Total cost of sales	46,143	54,899	156,985	153,376
Gross profit	20,254	25,611	71,860	41,507
Operating Expenses [Abstract]
Selling, general and administrative expenses	4,068	6,126	14,704	18,040
Research and development expenses	5,166	7,135	19,484	22,326
Restructuring and other charges	7,870	763	10,574	4,787
Total operating expenses	17,104	14,024	44,762	45,153
Operating income (loss) from discontinued operations	3,150	11,587	27,098	(3,646)
Foreign currency gain (loss), net	(797)	780	1,277	2,533
Others, net	18	(10)	66	(59)
Income (loss) from discontinued operations before income tax expense	2,371	12,357	28,441	(1,172)
Income tax expense (benefit)	14,173	(280)	15,517	(209)
Gain on sale of discontinued operations	287,117		287,117
Transaction costs	(10,814)		(10,814)
Income (loss) from discontinued operations, net of tax	264,501	12,637	289,227	(963)
Foundry Services Group [Member] | Discontinued Operations [Member]
Revenues:
Total revenues	72,674	90,404	254,732	220,659
Cost of sales:
Total cost of sales	52,420	64,793	182,872	179,152
Fab Three Foundry Services [Member] | Discontinued Operations [Member]
Revenues:
Total revenues	(6,277)	(9,894)	(25,887)	(25,776)
Cost of sales:
Total cost of sales	$ (6,277)	$ (9,894)	$ (25,887)	$ (25,776)