Open Contracts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Derivative [Line Items]
Notional Amounts (in US Dollars)	$ 180,078
Net Unrealized Gain (Loss)	(2,617)
Cash Flow Hedging | Foreign currency contracts | Currency, Australian Dollar
Derivative [Line Items]
Notional Amounts (in US Dollars)	11,210
Net Unrealized Gain (Loss)	(78)
Cash Flow Hedging | Foreign currency contracts | Currency, Canadian Dollar
Derivative [Line Items]
Notional Amounts (in US Dollars)	99,001
Net Unrealized Gain (Loss)	(1,185)
Cash Flow Hedging | Foreign currency contracts | Currency, Euro
Derivative [Line Items]
Notional Amounts (in US Dollars)	3,130
Net Unrealized Gain (Loss)	(70)
Cash Flow Hedging | Foreign currency contracts | Currency, Japanese Yen
Derivative [Line Items]
Notional Amounts (in US Dollars)	49,566
Net Unrealized Gain (Loss)	(1,817)
Cash Flow Hedging | Foreign currency contracts | Currency, Mexican Peso
Derivative [Line Items]
Notional Amounts (in US Dollars)	10,647
Net Unrealized Gain (Loss)	692
Cash Flow Hedging | Foreign currency contracts | Currency, Swedish Krone
Derivative [Line Items]
Notional Amounts (in US Dollars)	6,524
Net Unrealized Gain (Loss)	$ (159)