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Schedule II - Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Allowance for Doubtful Accounts [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | $ 1,395 | $ 1,258 | $ 875
Additions charged to costs and expenses | 419 | 774 | 925
Deductions | (368) | (651) | (512)
Other additions or deductions | (5) | 14 | (30)
Balance at end of period | 1,441 | 1,395 | 1,258
Reserve for Credit Memos [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 644 | 369 | 338
Additions charged to costs and expenses | 418 | 642 | 367
Deductions | (390) | (367) | (336)
Other additions or deductions | 0 | 0 | 0
Balance at end of period | 672 | 644 | 369
Slow-Moving and Obsolete Inventory Reserve [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 6,773 | 5,875 | 5,607
Additions charged to costs and expenses | 2,672 | 1,981 | 1,480
Deductions | (1,006) | (828) | (1,132)
Other additions or deductions | (439) | (255) | (80)
Balance at end of period | 8,000 | 6,773 | 5,875
Accrued Product Warranty [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 1,229 | 824 | 536
Additions charged to costs and expenses | 443 | 1,384 | 1,968
Deductions | (475) | (983) | (1,467)
Other additions or deductions | (57) | 4 | (213)
Balance at end of period | 1,140 | 1,229 | 824
U.S.Tax Capital Loss [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 2,034 | 2,053 | 2,056
Additions charged to costs and expenses | 0 | 0 | 0
Deductions | (49) | (19) | (3)
Other additions or deductions | (1,985) | 0 | 0
Balance at end of period | 0 | 2,034 | 2,053
Foreign Net Operating Loss Tax Carryforwards [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 295 | 1,062 | 937
Additions charged to costs and expenses | 1,096 | 0 | 269
Deductions | (115) | (760) | (165)
Other additions or deductions | (70) | (7) | 21
Balance at end of period | $ 1,206 | $ 295 | $ 1,062

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total increases or decreases in allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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