Restructuring and Impairment Charges - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended		3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Impairment charges	$ 10,269	$ 6,378
Dawin Electronics [Member]
Restructuring Cost and Reserve [Line Items]
Impairment of goodwill		3,389	3,389
Dawin Electronics [Member] | Technology [Member]
Restructuring Cost and Reserve [Line Items]
Impairment charges		1,864	1,864
Machinery and equipment [Member] | Dawin Electronics [Member]
Restructuring Cost and Reserve [Line Items]
Impairment charges		508	508
Fabrication facility [Member]
Restructuring Cost and Reserve [Line Items]
Impairment charges		617
Restructuring charges		1,829
Fabrication facility [Member] | Dawin Electronics [Member]
Restructuring Cost and Reserve [Line Items]
Impairment charges		5,870
Six Inch Fabrication Facility Closure [Member]
Restructuring Cost and Reserve [Line Items]
Impairment charges	10,269			10,269
Six Inch Fabrication Facility Closure [Member] | Machinery and equipment [Member]
Restructuring Cost and Reserve [Line Items]
Impairment charges	1,763			1,763
Six Inch Fabrication Facility Closure [Member] | Buildings [Member]
Restructuring Cost and Reserve [Line Items]
Impairment charges	8,239			8,239
Six Inch Fabrication Facility Closure [Member] | Other tangible assets [Member]
Restructuring Cost and Reserve [Line Items]
Impairment charges	$ 267			$ 267