Summary of Notional Amounts Fair Values and Classification of Outstanding Derivatives by Risk Category and Instrument Type (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Derivatives Designated As Hedging Instruments | Other Liabilities | Interest Rate Swap Contracts
Derivatives, Fair Value [Line Items]
Notional Amount	$ 200,000	[1]	$ 75,920	[1]
Liability Derivatives Fair Value	728	[1]	855	[1]
Derivatives Not Designated As Hedging Instruments | Other Current Assets | Foreign Currency Forwards
Derivatives, Fair Value [Line Items]
Notional Amount	35,221	[1]	14,138	[1]
Asset Derivatives Fair Value	652	[1]	43	[1]
Derivatives Not Designated As Hedging Instruments | Accrued Liabilities | Foreign Currency Forwards
Derivatives, Fair Value [Line Items]
Notional Amount	14,035	[1]	228,338	[1]
Asset Derivatives Fair Value	8	[1]	150	[1]
Liability Derivatives Fair Value	$ 238	[1]	$ 2,029	[1]

[1] Notional amounts represent the gross contract amounts of the outstanding derivatives excluding the total notional amount of positions that have been effectively closed through offsetting positions. The net gains and net losses associated with positions that have been effectively closed through offsetting positions but not yet settled are included in the asset and liability derivatives fair value columns, respectively.