Fair Value Position of Derivatives (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Notional Amount	$ 43,964	$ 48,022
Fair Value	(285)	246
Not Designated as Hedges under ASC 815 | Prepaid and other | Foreign currency exchange forwards
Derivative [Line Items]
Notional Amount	9,633	43,265
Maturity Dates		2014-01
Fair Value	30	255
Not Designated as Hedges under ASC 815 | Prepaid and other | Foreign currency exchange forwards | Minimum
Derivative [Line Items]
Maturity Dates	2014-10
Not Designated as Hedges under ASC 815 | Prepaid and other | Foreign currency exchange forwards | Maximum
Derivative [Line Items]
Maturity Dates	2014-11
Not Designated as Hedges under ASC 815 | Accrued expenses and other current liabilities | Foreign currency exchange forwards
Derivative [Line Items]
Notional Amount	34,331	4,757
Maturity Dates	2014-10	2014-01
Fair Value	$ (315)	$ (9)