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Schedule II - Valuation and Qualifying Accounts (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
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