Fair Value Position of Derivatives (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Derivative [Line Items]
Notional Amount	$ 28,279	$ 56,087
Fair Value	33	(34)
Not Designated as Hedges under ASC 815 | Prepaid and other | Foreign currency exchange forwards
Derivative [Line Items]
Notional Amount	7,952	15,604
Maturity Dates	2013-10	2013-01
Fair Value	50	36
Not Designated as Hedges under ASC 815 | Accrued expenses and other current liabilities | Foreign currency exchange forwards
Derivative [Line Items]
Notional Amount	20,327	40,483
Maturity Dates	2013-10	2013-01
Fair Value	$ (17)	$ (70)