Fair Value Measurements - Additional Information (Detail) (USD $)	12 Months Ended		3 Months Ended	0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Jul. 18, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proceeds from issuance of senior notes		$ 218,836,000
Impairment charges	10,269,000	6,378,000
Six Inch Fabrication Facility Closure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment charges	10,269,000		10,269,000
Fabrication facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment charges		617,000
Other Asset Class [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets fair value on recurring basis	0		0
Senior notes [Member] | 6.625% senior notes due 2021 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proceeds from issuance of senior notes	218,800,000			218,800,000
Interest rate	6.625%	6.625%	6.625%	6.625%
Due date	Jul. 15, 2021	Jul. 15, 2021		Jul. 15, 2021
Aggregate principal amount	225,000,000		225,000,000	225,000,000
Original debt issue discount	965,000	1,077,000	965,000	1,100,000
Debt issuance costs paid	5,100,000			5,100,000
Senior notes [Member] | 10.500% senior notes due 2018 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate	10.50%		10.50%
Due date	Apr. 15, 2018
Dawin Electronics [Member] | Fabrication facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment charges		$ 5,870,000