Information Related to Recurring Fair Value Measurement of Derivative Instruments in Our Consolidated Condensed Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Foreign Currency Derivatives | Not a hedge
Derivatives Fair Value [Line Items]
Asset Derivatives, Fair Value, Total	$ 7,107
Fair Value, Inputs, Level 2 | Currency Related Swap
Derivatives Fair Value [Line Items]
Net Asset/(Liabilities)	(13,332)
Fair Value, Inputs, Level 2 | Currency Related Swap | Not a hedge
Derivatives Fair Value [Line Items]
Liability Derivatives, Fair value	(13,332)
Fair Value, Inputs, Level 2 | Currency Related Swap | Not a hedge | Current Liabilities
Derivatives Fair Value [Line Items]
Liability Derivatives, Fair value	(4,315)
Fair Value, Inputs, Level 2 | Currency Related Swap | Not a hedge | Non-current Liabilities
Derivatives Fair Value [Line Items]
Liability Derivatives, Fair value	(9,017)
Fair Value, Inputs, Level 2 | Foreign Currency Derivatives | Designated as Hedging Instrument | Current Liabilities
Derivatives Fair Value [Line Items]
Liability Derivatives, Fair value	(502)
Fair Value, Inputs, Level 2 | Foreign Currency Derivatives | Not a hedge
Derivatives Fair Value [Line Items]
Net Asset/(Liabilities)	6,605
Liability Derivatives, Fair value	(502)
Fair Value, Inputs, Level 2 | Foreign Currency Derivatives | Not a hedge | Non-current Assets
Derivatives Fair Value [Line Items]
Net Asset/(Liabilities)	4,821
Asset Derivatives, Fair Value, Total	4,821
Fair Value, Inputs, Level 2 | Commodity derivatives | Designated as Hedging Instrument | Current Assets
Derivatives Fair Value [Line Items]
Net Asset/(Liabilities)	76
Asset Derivatives, Fair Value, Total	76
Fair Value, Inputs, Level 2 | Contract One | Foreign Currency Derivatives | Designated as Hedging Instrument | Current Liabilities
Derivatives Fair Value [Line Items]
Net Asset/(Liabilities)	(344)
Fair Value, Inputs, Level 2 | Contract One | Foreign Currency Derivatives | Designated as Hedging Instrument | Current Assets
Derivatives Fair Value [Line Items]
Asset Derivatives, Fair Value, Total	158
Fair Value, Inputs, Level 2 | Contract Two | Foreign Currency Derivatives | Not a hedge | Current Assets
Derivatives Fair Value [Line Items]
Net Asset/(Liabilities)	2,128
Asset Derivatives, Fair Value, Total	$ 2,128