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Inventories - Additional Information (Detail) (Inventory Valuation and Obsolescence [Member], USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Inventory [Line Items]    
Valuation allowances and reserves, period increase (decrease)   $ 85,000us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease
Raw Materials [Member]
    
Inventory [Line Items]    
Valuation allowances and reserves, period increase (decrease) 163,000us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_InventoryValuationAndObsolescenceMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventoryRawMaterialsMember		 803,000us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_InventoryValuationAndObsolescenceMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventoryRawMaterialsMember
Valuation allowances and reserves, deductions   $ 718,000us-gaap_ValuationAllowancesAndReservesDeductions
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_InventoryValuationAndObsolescenceMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_PublicUtilitiesInventoryRawMaterialsMember