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Product Warranty Reserve - Roll Forward of Product Warranty Reserve (Detail) (Warranty Reserves [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Warranty Reserves [Member]
   
Valuation and Qualifying Accounts Disclosure [Line Items]    
Balance at the beginning of period $ 892us-gaap_StandardProductWarrantyAccrual
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_WarrantyReservesMember
$ 1,140us-gaap_StandardProductWarrantyAccrual
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_WarrantyReservesMember
Additions charged to income 32us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_WarrantyReservesMember
98us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_WarrantyReservesMember
Warranty usage (107)us-gaap_StandardProductWarrantyAccrualPayments
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_WarrantyReservesMember
0us-gaap_StandardProductWarrantyAccrualPayments
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_WarrantyReservesMember
Currency translation (34)us-gaap_StandardProductWarrantyAccrualCurrencyTranslationIncreaseDecrease
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_WarrantyReservesMember
(6)us-gaap_StandardProductWarrantyAccrualCurrencyTranslationIncreaseDecrease
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_WarrantyReservesMember
End of period balance $ 783us-gaap_StandardProductWarrantyAccrual
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_WarrantyReservesMember
$ 1,232us-gaap_StandardProductWarrantyAccrual
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_WarrantyReservesMember