Open Foreign Currency Contracts (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Derivative [Line Items]
Notional Amounts (in US Dollars)	$ 135,616
Net Unrealized Gain (Loss)	882
Cash Flow Hedging | Foreign currency contracts | Currency, Australian Dollar
Derivative [Line Items]
Notional Amounts (in US Dollars)	5,869
Net Unrealized Gain (Loss)	78
Cash Flow Hedging | Foreign currency contracts | Currency, Canadian Dollar
Derivative [Line Items]
Notional Amounts (in US Dollars)	75,180
Net Unrealized Gain (Loss)	884
Cash Flow Hedging | Foreign currency contracts | Currency, Swedish Krone
Derivative [Line Items]
Notional Amounts (in US Dollars)	2,409
Net Unrealized Gain (Loss)	155
Cash Flow Hedging | Foreign currency contracts | Currency, Japanese Yen
Derivative [Line Items]
Notional Amounts (in US Dollars)	20,844
Net Unrealized Gain (Loss)	153
Cash Flow Hedging | Foreign currency contracts | Currency, Mexican Peso [Member]
Derivative [Line Items]
Notional Amounts (in US Dollars)	15,201
Net Unrealized Gain (Loss)	484
Cash Flow Hedging | Foreign currency contracts | Currency, Euro
Derivative [Line Items]
Notional Amounts (in US Dollars)	16,113
Net Unrealized Gain (Loss)	$ (872)