Original and Further Restatement of the Consolidated Financial Statements - Effects of Restatements of Condensed Consolidated Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net loss	$ (2,739)	$ (18,400)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	17,094	15,585
Amortization of debt costs	490	540
Amortization of exclusivity agreements	1,698	1,069
Provision for doubtful accounts	539	2,754
Deferred income taxes	75	(223)
Share-based compensation	4,103	4,714
Impairment of goodwill		19,193
Excess income tax benefit on employee stock-based awards	(202)	(82)
Other	1,581	(1,165)
Change in operating assets and liabilities:
Trade accounts receivable	6,118	30,374
Inventories	5,545	(8,777)
Prepaid expenses and other current assets	5,002	6,405
Trade accounts payable	(6,782)	(8,028)
Other current liabilities	3,401	9,485
Long-term assets	66	(1,425)
Long-term liabilities	(23)	(116)
Net cash provided by operating activities	35,966	51,903
Cash flows from investing activities:
Capital expenditures for property, plant and equipment	(11,324)	(19,427)
Capital expenditures for intangible assets	(170)	(4,525)
Purchase of other investments	(1,457)	(1,232)
Net cash used in investing activities	(12,919)	(25,184)
Cash flows from financing activities:
Net proceeds from issuance of common shares	10,333	3,431
(Repayment of) proceeds from bank borrowings, net		(16)
Changes in restricted cash	(11,023)	(1,371)
Repurchase of treasury shares		(39,494)
Excess income tax benefit on employee stock-based awards	202	82
Net cash used in financing activities	(20,488)	(37,368)
Effect of exchange rate changes on cash	(1,658)	611
Net decrease in cash and cash equivalents		(10,038)
Cash and cash equivalents at the beginning of the period	28,924	30,767
Cash and cash equivalents at the end of the period	29,825	20,729
Previously Reported [Member]
Cash flows from operating activities:
Net loss		(17,639)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization		15,459
Amortization of debt costs		540
Amortization of exclusivity agreements
Provision for doubtful accounts		4,225
Deferred income taxes		(223)
Share-based compensation		4,714
Impairment of goodwill		19,193
Excess income tax benefit on employee stock-based awards		(82)
Other		(520)
Change in operating assets and liabilities:
Trade accounts receivable		27,758
Inventories		(11,596)
Prepaid expenses and other current assets		5,541
Trade accounts payable		(8,028)
Other current liabilities		13,040
Long-term assets		482
Long-term liabilities		(912)
Net cash provided by operating activities		51,952
Cash flows from investing activities:
Capital expenditures for property, plant and equipment		(19,427)
Capital expenditures for intangible assets		(4,525)
Purchase of other investments
Net cash used in investing activities		(23,952)
Cash flows from financing activities:
Net proceeds from issuance of common shares		3,431
(Repayment of) proceeds from bank borrowings, net		(16)
Changes in restricted cash		(1,371)
Repurchase of treasury shares		(39,494)
Excess income tax benefit on employee stock-based awards		82
Net cash used in financing activities		(37,368)
Effect of exchange rate changes on cash		532
Net decrease in cash and cash equivalents		(8,836)
Cash and cash equivalents at the beginning of the period		31,055
Cash and cash equivalents at the end of the period		22,219
Further Restatement Adjustments [Member]
Cash flows from operating activities:
Net loss		(761)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization		126
Amortization of debt costs
Amortization of exclusivity agreements		1,069
Provision for doubtful accounts		(1,471)
Deferred income taxes
Share-based compensation
Impairment of goodwill
Excess income tax benefit on employee stock-based awards
Other		(645)
Change in operating assets and liabilities:
Trade accounts receivable		2,616
Inventories		2,819
Prepaid expenses and other current assets		864
Trade accounts payable
Other current liabilities		(3,555)
Long-term assets		(1,907)
Long-term liabilities		796
Net cash provided by operating activities		(49)
Cash flows from investing activities:
Capital expenditures for property, plant and equipment
Capital expenditures for intangible assets
Purchase of other investments		(1,232)
Net cash used in investing activities		(1,232)
Cash flows from financing activities:
Net proceeds from issuance of common shares
(Repayment of) proceeds from bank borrowings, net
Changes in restricted cash
Repurchase of treasury shares
Excess income tax benefit on employee stock-based awards
Net cash used in financing activities
Effect of exchange rate changes on cash		79
Net decrease in cash and cash equivalents		(1,202)
Cash and cash equivalents at the beginning of the period		(288)
Cash and cash equivalents at the end of the period		$ (1,490)