Restatement of Consolidated Financial Statements - Schedule of Impact of Restatement Adjustments on Previously Reported Consolidated Statement of Operations (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net sales	$ 172,070,000	$ 193,533,000	$ 336,234,000	$ 387,855,000
Cost of sales	136,613,000	148,292,000	260,500,000	284,379,000
Gross profit	35,457,000	45,241,000	75,734,000	103,476,000
Selling, general and administrative expenses	30,746,000	20,951,000	55,773,000	41,759,000
Research and development expenses	24,059,000	21,625,000	47,196,000	42,640,000
Restructuring and impairment charges				2,446,000
Operating income	(19,348,000)	2,665,000	(27,235,000)	16,631,000
Other income (expenses)
Interest expense, net	(4,007,000)	(5,879,000)	(8,077,000)	(11,728,000)
Foreign currency gain (loss), net	38,424,000	(22,145,000)	29,018,000	(45,603,000)
Others	597,000	327,000	1,158,000	680,000
Net other income (expense)	35,014,000	(27,697,000)	22,099,000	(56,651,000)
Income (loss) before income taxes	15,666,000	(25,032,000)	(5,136,000)	(40,020,000)
Income tax expenses (benefits)	656,000	(364,000)	1,459,000	2,237,000
Net income (loss)	15,010,000	(24,668,000)	(6,595,000)	(42,257,000)
Earnings (loss) per common share-
Basic	$ 0.44	$ (0.70)	$ (0.19)	$ (1.19)
Diluted	$ 0.43	$ (0.70)	$ (0.19)	$ (1.19)
Weighted average number of shares-
Basic	34,056,359	35,474,001	34,054,626	35,506,527
Diluted	35,177,915	35,474,001	34,054,626	35,506,527
As Previously Reported [Member]
Net sales		215,289,000		420,587,000
Cost of sales		144,241,000		283,796,000
Gross profit		71,048,000		136,791,000
Selling, general and administrative expenses		19,709,000		39,500,000
Research and development expenses		21,131,000		41,713,000
Restructuring and impairment charges				2,446,000
Operating income		30,208,000		53,132,000
Other income (expenses)
Interest expense, net		(5,879,000)		(11,728,000)
Foreign currency gain (loss), net		(20,978,000)		(43,536,000)
Others		(230,000)		(490,000)
Net other income (expense)		(27,087,000)		(55,754,000)
Income (loss) before income taxes		3,121,000		(2,622,000)
Income tax expenses (benefits)		(1,315,000)		347,000
Net income (loss)		4,436,000		(2,969,000)
Earnings (loss) per common share-
Basic		$ 0.13		$ (0.08)
Diluted		$ 0.12		$ (0.08)
Weighted average number of shares-
Basic		35,474,001		35,506,527
Diluted		37,125,005		35,506,527
Adjustments [Member]
Net sales		(21,756,000)		(32,732,000)
Cost of sales		4,051,000		583,000
Gross profit		(25,807,000)		(33,315,000)
Selling, general and administrative expenses		1,242,000		2,259,000
Research and development expenses		494,000		927,000
Operating income		(27,543,000)		(36,501,000)
Other income (expenses)
Foreign currency gain (loss), net		(1,167,000)		(2,067,000)
Others		557,000		1,170,000
Net other income (expense)		(610,000)		(897,000)
Income (loss) before income taxes		(28,153,000)		(37,398,000)
Income tax expenses (benefits)		951,000		1,890,000
Net income (loss)		(29,104,000)		(39,288,000)
Adjustments [Member] | Revenue Recognition [Member]
Net sales		(21,199,000)		(31,615,000)
Cost of sales		(12,871,000)		(21,518,000)
Gross profit		(8,328,000)		(10,097,000)
Selling, general and administrative expenses		(160,000)		(249,000)
Operating income		(8,168,000)		(9,848,000)
Other income (expenses)
Foreign currency gain (loss), net		(1,182,000)		(2,089,000)
Others				53,000
Net other income (expense)		(1,182,000)		(2,036,000)
Income (loss) before income taxes		(9,350,000)		(11,884,000)
Net income (loss)		(9,350,000)		(11,884,000)
Adjustments [Member] | Inventory Reserves [Member]
Cost of sales		6,336,000		10,196,000
Gross profit		(6,336,000)		(10,196,000)
Operating income		(6,336,000)		(10,196,000)
Other income (expenses)
Income (loss) before income taxes		(6,336,000)		(10,196,000)
Net income (loss)		(6,336,000)		(10,196,000)
Adjustments [Member] | Understated Employee Benefits [Member]
Cost of sales		50,000		182,000
Gross profit		(50,000)		(182,000)
Selling, general and administrative expenses		27,000		46,000
Research and development expenses		22,000		73,000
Operating income		(99,000)		(301,000)
Other income (expenses)
Income (loss) before income taxes		(99,000)		(301,000)
Net income (loss)		(99,000)		(301,000)
Adjustments [Member] | Settlement Obligations [Member]
Cost of sales		11,561,000		11,561,000
Gross profit		(11,561,000)		(11,561,000)
Operating income		(11,561,000)		(11,561,000)
Other income (expenses)
Income (loss) before income taxes		(11,561,000)		(11,561,000)
Net income (loss)		(11,561,000)		(11,561,000)
Adjustments [Member] | Tax Matters [Member]
Selling, general and administrative expenses		444,000		624,000
Operating income		(444,000)		(624,000)
Other income (expenses)
Income (loss) before income taxes		(444,000)		(624,000)
Income tax expenses (benefits)		951,000		1,890,000
Net income (loss)		(1,395,000)		(2,514,000)
Adjustments [Member] | Maintenance Costs [Member]
Cost of sales		893,000		3,325,000
Gross profit		(893,000)		(3,325,000)
Research and development expenses		16,000		71,000
Operating income		(909,000)		(3,396,000)
Other income (expenses)
Income (loss) before income taxes		(909,000)		(3,396,000)
Net income (loss)		(909,000)		(3,396,000)
Adjustments [Member] | Cost Center Allocation [Member]
Cost of sales		(881,000)		(1,725,000)
Gross profit		881,000		1,725,000
Selling, general and administrative expenses		897,000		1,757,000
Research and development expenses		(16,000)		(32,000)
Adjustments [Member] | Account Classification [Member]
Net sales		(557,000)		(1,117,000)
Cost of sales		(608,000)		(1,012,000)
Gross profit		51,000		(105,000)
Research and development expenses		608,000		1,012,000
Operating income		(557,000)		(1,117,000)
Other income (expenses)
Others		557,000		1,117,000
Net other income (expense)		557,000		1,117,000
Adjustments [Member] | Other Adjustments [Member]
Cost of sales		(429,000)		(426,000)
Gross profit		429,000		426,000
Selling, general and administrative expenses		34,000		81,000
Research and development expenses		(136,000)		(197,000)
Operating income		531,000		542,000
Other income (expenses)
Foreign currency gain (loss), net		15,000		22,000
Net other income (expense)		15,000		22,000
Income (loss) before income taxes		546,000		564,000
Net income (loss)		$ 546,000		$ 564,000