Information Related to Recurring Fair Value Measurement of Derivative Instruments in Our Consolidated Condensed Balance Sheet (Detail) - Fair Value, Inputs, Level 2 - Foreign Currency Derivatives - Designated as Hedging Instrument $ in Thousands	Sep. 30, 2018 USD ($)
Derivatives Fair Value [Line Items]
Asset Derivatives, Fair Value	$ 1,299
Net Asset/ (Liabilities)	$ 1,299