Carrying value as of the balance sheet date of obligations incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph a

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Liabilities

-URI http://asc.fasb.org/extlink&oid=6509677

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(a))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Original and Further Restatement of the Consolidated Financial Statements - Effects of Original Restatement and Further Restatement on Consolidated Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 28,924				$ 30,767				$ 32,743	$ 13,561
Restricted cash	23,761				21,314
Trade accounts receivable, less allowances	70,811us-gaap_AccountsReceivableNetCurrent				103,802us-gaap_AccountsReceivableNetCurrent
Inventories	72,678us-gaap_InventoryNet				69,813us-gaap_InventoryNet
Deferred income taxes	39,999us-gaap_DeferredTaxAssetsNetCurrent				38,487us-gaap_DeferredTaxAssetsNetCurrent
Prepaid expenses and other current assets	28,933				36,449
Total current assets	265,106us-gaap_AssetsCurrent				300,632us-gaap_AssetsCurrent
Property, plant and equipment, net	54,372us-gaap_PropertyPlantAndEquipmentNet				52,793us-gaap_PropertyPlantAndEquipmentNet
Patents and other intangible assets, net	9,046				7,290
Goodwill	53,565us-gaap_Goodwill		72,758us-gaap_Goodwill		74,388us-gaap_Goodwill				73,094us-gaap_Goodwill
Deferred income taxes	22,394us-gaap_DeferredTaxAssetsNetNoncurrent				21,523us-gaap_DeferredTaxAssetsNetNoncurrent
Other long-term assets	7,492us-gaap_OtherAssetsNoncurrent				7,920us-gaap_OtherAssetsNoncurrent
Total assets	411,975us-gaap_Assets	415,524us-gaap_Assets	446,321us-gaap_Assets	464,153us-gaap_Assets	464,546us-gaap_Assets	528,174us-gaap_Assets	520,848us-gaap_Assets	680,596us-gaap_Assets
Current liabilities:
Bank borrowings					16
Trade accounts payable	20,674us-gaap_AccountsPayableTradeCurrent				22,575us-gaap_AccountsPayableTradeCurrent
Other current liabilities	49,676us-gaap_OtherLiabilitiesCurrent				42,742us-gaap_OtherLiabilitiesCurrent
Total current liabilities	70,350us-gaap_LiabilitiesCurrent				65,333us-gaap_LiabilitiesCurrent
Long-term debt	20,000us-gaap_SecuredLongTermDebt				20,000us-gaap_SecuredLongTermDebt
Deferred income taxes	13,026				11,350
Other long-term liabilities	12,736us-gaap_OtherLiabilitiesNoncurrent				11,424us-gaap_OtherLiabilitiesNoncurrent
Total liabilities	116,112us-gaap_Liabilities	108,531us-gaap_Liabilities	114,175us-gaap_Liabilities	103,178us-gaap_Liabilities	108,107us-gaap_Liabilities	195,755us-gaap_Liabilities	207,927us-gaap_Liabilities	382,051us-gaap_Liabilities
Contingencies (Note 17)
Shareholders' equity
Common shares $0.10 par value; 50,000,000 shares authorized; 18,102,335 and 19,339,329 issued and outstanding as of December 31, 2013 and 2012, respectively	1,810us-gaap_CommonStockValue				1,934us-gaap_CommonStockValue
Additional paid-in capital	216,653				246,306
Retained earnings	73,897				102,709
Accumulated other comprehensive income	3,503				5,490
Total shareholders' equity	295,863us-gaap_StockholdersEquity	306,993us-gaap_StockholdersEquity	332,146us-gaap_StockholdersEquity	360,975us-gaap_StockholdersEquity	356,439us-gaap_StockholdersEquity	332,419us-gaap_StockholdersEquity	312,921us-gaap_StockholdersEquity	298,545us-gaap_StockholdersEquity	280,304us-gaap_StockholdersEquity
Total liabilities and shareholders' equity	411,975	415,524	446,321	464,153	464,546	528,174	520,848	680,596
Originally Reported [Member]
Current assets:
Cash and cash equivalents	30,486				31,055
Restricted cash	23,761
Trade accounts receivable, less allowances	75,567
Inventories	90,577
Deferred income taxes	33,947
Prepaid expenses and other current assets	25,906
Total current assets	280,244
Property, plant and equipment, net	54,606
Patents and other intangible assets, net	9,046
Goodwill	53,565
Deferred income taxes	18,336
Other long-term assets	7,385
Total assets	423,182	430,058	459,450
Current liabilities:
Trade accounts payable	20,674
Other current liabilities	46,146
Total current liabilities	66,820
Long-term debt	20,000
Deferred income taxes	13,132
Other long-term liabilities	12,736
Total liabilities	112,688	111,001	114,223
Contingencies (Note 17)
Shareholders' equity
Common shares $0.10 par value; 50,000,000 shares authorized; 18,102,335 and 19,339,329 issued and outstanding as of December 31, 2013 and 2012, respectively	1,810
Additional paid-in capital	216,653
Retained earnings	89,332
Accumulated other comprehensive income	2,699
Total shareholders' equity	310,494	319,057	345,227
Total liabilities and shareholders' equity	423,182	430,058	459,450
Further Restatement Adjustments [Member]
Current assets:
Cash and cash equivalents	(1,562)				(288)				(464)
Restricted cash
Trade accounts receivable, less allowances	(4,756)				(3,510)
Inventories	(17,899)				(13,560)
Deferred income taxes	6,052				5,037
Prepaid expenses and other current assets	3,027				(2,370)
Total current assets	(15,138)				(9,951)
Property, plant and equipment, net	(234)				(1,042)
Patents and other intangible assets, net
Goodwill
Deferred income taxes	4,058				2,642
Other long-term assets	107
Total assets	(11,207)	(14,534)	(13,129)	(11,605)	(8,351)	(11,392)	(9,547)	(13,510)
Current liabilities:
Bank borrowings
Trade accounts payable
Other current liabilities	3,530				3,148
Total current liabilities	3,530				3,148
Long-term debt
Deferred income taxes	(106)				(106)
Other long-term liabilities
Total liabilities	3,424	(2,470)	(48)	812	3,042	2,156	2,731	317
Contingencies (Note 17)
Shareholders' equity
Common shares $0.10 par value; 50,000,000 shares authorized; 18,102,335 and 19,339,329 issued and outstanding as of December 31, 2013 and 2012, respectively
Additional paid-in capital
Retained earnings	(15,435)				(12,138)
Accumulated other comprehensive income	804				745
Total shareholders' equity	(14,631)	(12,064)	(13,081)	(12,417)	(11,393)	(13,548)	(12,278)	(13,827)
Total liabilities and shareholders' equity	(11,207)	(14,534)	(13,129)	(11,605)	(8,351)	(11,392)	(9,547)	(13,510)
As Reported in the 2012 Form 10-K Prior to Original Restatement [Member]
Current assets:
Cash and cash equivalents					31,055				33,207	13,561
Restricted cash					21,314
Trade accounts receivable, less allowances					150,316
Inventories					88,744
Deferred income taxes					16,959
Prepaid expenses and other current assets					32,056
Total current assets					340,444
Property, plant and equipment, net					51,362
Patents and other intangible assets, net					6,880
Goodwill					74,388
Deferred income taxes					19,904
Other long-term assets					11,303
Total assets					504,281	565,073	553,320	707,586
Current liabilities:
Bank borrowings					16
Trade accounts payable					21,812
Other current liabilities					46,969
Total current liabilities					68,797
Long-term debt					20,000
Deferred income taxes					11,456
Other long-term liabilities					4,930
Total liabilities					105,183	187,463	199,104	369,178
Contingencies (Note 17)
Shareholders' equity
Common shares $0.10 par value; 50,000,000 shares authorized; 18,102,335 and 19,339,329 issued and outstanding as of December 31, 2013 and 2012, respectively					1,934
Additional paid-in capital					246,111
Retained earnings					148,549
Accumulated other comprehensive income					2,504
Total shareholders' equity					399,098	377,610	354,216	338,408
Total liabilities and shareholders' equity					504,281	565,073	553,320	707,586
Original Restatement Adjustments [Member]
Current assets:
Cash and cash equivalents
Restricted cash
Trade accounts receivable, less allowances					(43,004)
Inventories					(5,371)
Deferred income taxes					16,491
Prepaid expenses and other current assets					2,023
Total current assets					(29,861)
Property, plant and equipment, net					2,473
Patents and other intangible assets, net					410
Goodwill
Deferred income taxes					(1,023)
Other long-term assets					(3,383)
Total assets	0	0	0	(27,622)	(31,384)	(25,507)	(22,925)	(13,480)
Current liabilities:
Bank borrowings
Trade accounts payable					763
Other current liabilities					(7,375)
Total current liabilities					(6,612)
Long-term debt
Deferred income taxes
Other long-term liabilities					6,494
Total liabilities	0	0	0	1,154	(118)	6,136	6,092	12,556
Contingencies (Note 17)
Shareholders' equity
Common shares $0.10 par value; 50,000,000 shares authorized; 18,102,335 and 19,339,329 issued and outstanding as of December 31, 2013 and 2012, respectively
Additional paid-in capital					195
Retained earnings					(33,702)
Accumulated other comprehensive income					2,241
Total shareholders' equity	0	0	0	(28,776)	(31,266)	(31,643)	(29,017)	(26,036)
Total liabilities and shareholders' equity	0	0	0	(27,622)	(31,384)	(25,507)	(22,925)	(13,480)
As Originally Restated in the 2012 Form 10-K/A [Member]
Current assets:
Cash and cash equivalents					31,055				33,207	13,561
Restricted cash					21,314
Trade accounts receivable, less allowances					107,312
Inventories					83,373
Deferred income taxes					33,450
Prepaid expenses and other current assets					34,079
Total current assets					310,583
Property, plant and equipment, net					53,835
Patents and other intangible assets, net					7,290
Goodwill					74,388
Deferred income taxes					18,881
Other long-term assets					7,920
Total assets					472,897	539,566	530,395	694,106
Current liabilities:
Bank borrowings					16
Trade accounts payable					22,575
Other current liabilities					39,594
Total current liabilities					62,185
Long-term debt					20,000
Deferred income taxes					11,456
Other long-term liabilities					11,424
Total liabilities					105,065	193,599	205,196	381,734
Contingencies (Note 17)
Shareholders' equity
Common shares $0.10 par value; 50,000,000 shares authorized; 18,102,335 and 19,339,329 issued and outstanding as of December 31, 2013 and 2012, respectively					1,934
Additional paid-in capital					246,306
Retained earnings					114,847
Accumulated other comprehensive income					4,745
Total shareholders' equity					367,832	345,967	325,199	312,372
Total liabilities and shareholders' equity					$ 472,897	$ 539,566	$ 530,395	$ 694,106