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Notional Amounts and Gross Fair Values for Derivative Instruments without Hedge Accounting Designation (Detail) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Notional Amount	$ 9,000,000
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	12,136,000	$ 14,086,000
Fair value of current assets	353,000
Fair value of current liabilities		(581,000)
Not Designated as Hedging Instrument \| Forward Contracts [Member]
Derivative [Line Items]
Notional Amount	12,136,000	5,572,000
Fair value of current assets	353,000
Fair value of current liabilities		(329,000)
Not Designated as Hedging Instrument \| Forward Contracts [Member] \| Canada, Dollars
Derivative [Line Items]
Notional Amount	10,701,000	4,200,000
Fair value of current assets	309,000
Fair value of current liabilities		(246,000)
Not Designated as Hedging Instrument \| Forward Contracts [Member] \| Other Currencies
Derivative [Line Items]
Notional Amount	1,435,000	1,372,000
Fair value of current assets	$ 44,000
Fair value of current liabilities		(83,000)
Not Designated as Hedging Instrument \| Options Held [Member] \| Canada, Dollars
Derivative [Line Items]
Notional Amount		8,514,000
Fair value of current liabilities		$ (252,000)

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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