Outstanding Foreign Currency Forward Contracts and Options (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2012		Dec. 31, 2011
Cash Flow Hedge, Option, Philippine Pesos [Member]
Derivative [Line Items]
Notional amount	$ 57,000	[1]	$ 85,500	[1]
Settle through date	May 31, 2013	[1]	Sep. 30, 2012	[1]
Cash Flow Hedge, Forward, Philippine Pesos [Member]
Derivative [Line Items]
Notional amount	3,000		12,000
Settle through date	Oct. 31, 2012		Mar. 31, 2012
Cash Flow Hedge Forward Costa Rican Colones [Member]
Derivative [Line Items]
Notional amount	53,000		30,000
Settle through date	Sep. 30, 2013		Sep. 30, 2012
Derivatives Not Designated As Hedges, Forward Contracts [Member]
Derivative [Line Items]
Notional amount	$ 42,992	[2]	$ 27,192	[2]
Settle through date	Jan. 31, 2013	[2]	Mar. 31, 2012	[2]

[1] Cash flow hedge as defined under ASC 815. Purpose is to protect against the risk that eventual cash flows resulting from such transactions will be adversely affected by changes in exchange rates.

[2] Foreign currency hedge contract not designated as a hedge as defined under ASC 815. Purpose is to reduce the effects on the Company's operating results and cash flows from fluctuations caused by volatility in currency exchange rates, primarily related to intercompany loan payments and cash held in non-functional currencies.