Derivatives Financial Instruments - Additional Information (Detail) In Thousands, unless otherwise specified			9 Months Ended					9 Months Ended
	Sep. 30, 2013 Canadian Dollar [Member]	Sep. 30, 2013 Canadian Dollar [Member] Forward currency contract [Member] CAD	Sep. 30, 2013 Canadian Dollar [Member] Forward currency contract [Member] Beginning Of Period [Member]	Sep. 30, 2013 Canadian Dollar [Member] Forward currency contract [Member] End Of Period [Member]	Sep. 30, 2013 Canadian Dollar [Member] Forward currency contract [Member] Minimum [Member]	Sep. 30, 2013 Canadian Dollar [Member] Forward currency contract [Member] Maximum [Member]	Sep. 30, 2013 Euro Member Countries, Euro	Sep. 30, 2013 First Contract [Member] Euro Member Countries, Euro Forward currency contract [Member] EUR (€)	Sep. 30, 2013 Second Contract [Member] Euro Member Countries, Euro Forward currency contract [Member] EUR (€)	Sep. 30, 2013 Scenario, Forecast [Member] USD ($)
Derivative [Line Items]
Pre-tax unrealized gains on forward currency contract hedges										$ 10
Contracts obligate the company to purchase		2,655
Contracts maturity period			Nov. 06, 2013	Apr. 30, 2013				Jul. 02, 2014	Jan. 31, 2014
Currency exchange rate, re measurement	0.9706				0.9513	0.9675	1.3505	1.4251	1.3538
Contracts requires the company to sell								€ 800	€ 100