Long-Term Debt - Additional Information (Detail)					9 Months Ended			9 Months Ended	12 Months Ended	0 Months Ended	1 Months Ended	9 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2014 USD ($)	Sep. 30, 2014 EUR (€)	Dec. 31, 2013 USD ($)	Aug. 30, 2010 USD ($)	Sep. 30, 2014 Revolving Credit Facility [Member]	Dec. 31, 2013 Revolving Credit Facility [Member] USD ($)	Aug. 30, 2010 Revolving Credit Facility [Member] USD ($)	Sep. 30, 2014 Revolving Credit Facility [Member] LIBOR [Member]	Dec. 31, 2013 Revolving Credit Facility [Member] LIBOR [Member]	Aug. 30, 2010 Term Loan Facility [Member] USD ($)	May 31, 2012 Term Loan Facility [Member] USD ($)	Sep. 30, 2014 Term Loan Facility [Member] USD ($)	Dec. 31, 2013 Term Loan Facility [Member] USD ($)	Sep. 30, 2014 Term Loan Facility [Member] Base rate [Member] Maximum [Member]	Dec. 31, 2013 New Credit Agreement [Member] LIBOR [Member] Maximum [Member]	Dec. 31, 2013 New Credit Agreement [Member] Base rate [Member] Maximum [Member]	Sep. 30, 2014 Prior Credit Agreement [Member] LIBOR [Member]	Dec. 31, 2013 Prior Credit Agreement [Member] LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument term (in years)					5 years							5 years
Maximum borrowing capacity	$ 7,300,000	€ 5,800,000	$ 8,000,000				$ 200,000,000
Maximum borrowing capacity										100,000,000
Available capacity under the revolving credit facility				100,000,000
Amount outstanding	0		0			20,000,000
Margin on variable rate								2.50%	2.50%						3.25%	2.25%
Variable rate basis														LIBOR
Effective interest rate (as a Percent)																	2.70%	2.70%
Revolving credit facility due date					Aug. 30, 2015
Amount of restricted net assets	178,600,000		168,500,000
Restricted cash	34,630,000		23,761,000
Debt issuance costs incurred												5,000,000
Write-off of debt issue costs											800,000
Deferred debt issuance costs, net												$ 600,000	$ 1,100,000