Schedule II - Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 1,441	$ 1,395	$ 1,258
Additions charged to costs and expenses	803	419	774
Deductions	(260)	(368)	(651)
Other additions or deductions	(41)	(5)	14
Balance at end of period	1,943	1,441	1,395
Reserve for Credit Memos [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	672	644	369
Additions charged to costs and expenses	408	418	642
Deductions	(652)	(390)	(367)
Other additions or deductions	0	0	0
Balance at end of period	428	672	644
Slow-Moving and Obsolete Inventory Reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	8,075	6,773	5,875
Additions charged to costs and expenses	2,244	2,672	1,981
Deductions	(701)	(1,006)	(828)
Other additions or deductions	(435)	(364)	(255)
Balance at end of period	9,183	8,075	6,773
Accrued Product Warranty [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	1,140	1,229	824
Additions charged to costs and expenses	(45)	443	1,384
Deductions	(133)	(475)	(983)
Other additions or deductions	(70)	(57)	4
Balance at end of period	892	1,140	1,229
U.S.Tax Capital Loss [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		2,034	2,053
Additions charged to costs and expenses		0	0
Deductions		(49)	(19)
Other additions or deductions		(1,985)	0
Balance at end of period		0	2,034
Foreign Net Operating Loss Tax Carryforwards [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	1,420	295	1,062
Additions charged to costs and expenses	2,553	1,310	0
Deductions	(232)	(115)	(760)
Other additions or deductions	(127)	(70)	(7)
Balance at end of period	$ 3,614	$ 1,420	$ 295

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.

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

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