Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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The premium (cost) of a hedge, expensed during the period.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The effective portion of gain reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

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Maximum period of time the entity is hedging its exposure to variability in future cash flows for forecasted transactions, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes forecasted transactions related to payment of variable interest on existing financial instruments.

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Maximum amount of time remaining before foreign currency exchange rate derivatives mature or expire, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Derivatives and Hedging - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Derivative [Line Items]
Maximum maturity for foreign currency derivatives			12 months
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net			$ 0
Forward points expensed on derivatives	$ 116,000		335,000
Net losses from accumulated other comprehensive income (loss) into net earnings during the next 12 months	407,000		407,000
Effect of Cash Flow Hedges on Results of Operations [Abstract]
Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion)			394,000
Foreign currency losses	(560,000)	$ 423,000	(3,068,000)	$ 1,122,000
Foreign Exchange Forward \| Cost Of Goods Sold
Derivative [Line Items]
Gain Reclassified from AOCI into COGS	168,000	1,067,000	32,000	249,000
Designated as Hedging Instrument \| Foreign Exchange Contract
Derivative [Line Items]
Notional amounts of derivatives	9,462,000		9,462,000		$ 14,210,000
Not Designated as Hedging Instrument \| Foreign Exchange Contract
Derivative [Line Items]
Notional amounts of derivatives	32,538,000		32,538,000		$ 4,821,000
Cash Flow Hedging \| Designated as Hedging Instrument \| Foreign Exchange Forward
Effect of Cash Flow Hedges on Results of Operations [Abstract]
Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion)	256,000	(371,000)	394,000	(2,673,000)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings (Effective Portion)	$ 168,000	$ (1,067,000)	$ (32,000)	$ 249,000
Minimum
Derivative [Line Items]
Maximum maturity for foreign currency cash flow hedge			12 months
Maximum
Derivative [Line Items]
Maximum maturity for foreign currency cash flow hedge			15 months