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Long-Term Debt - Additional Information (Detail)	0 Months Ended		9 Months Ended			9 Months Ended			9 Months Ended				9 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014 IKB Loan [Member] Installment DebtAgreements	Apr. 11, 2013 IKB Loan [Member] USD ($)	Apr. 11, 2013 IKB Loan [Member] EUR (€)	Sep. 30, 2014 2014 IKB Loan [Member] Installment	Sep. 04, 2014 2014 IKB Loan [Member] USD ($)	Sep. 04, 2014 2014 IKB Loan [Member] EUR (€)	Sep. 30, 2014 Maximum [Member]	Sep. 30, 2014 Federal Funds Rate [Member]	Sep. 30, 2014 5.375% Notes [Member]	Oct. 03, 2012 5.375% Notes [Member] USD ($)	Sep. 30, 2014 Revolving Credit Facility [Member]	Nov. 21, 2011 Revolving Credit Facility [Member] USD ($)	Sep. 30, 2014 Revolving Credit Facility, Due Nov. 2016 [Member]	Sep. 30, 2014 Revolving Credit Facility, Due Nov. 2016 [Member] Minimum [Member]	Sep. 30, 2014 Revolving Credit Facility, Due Nov. 2016 [Member] Maximum [Member]	Sep. 30, 2014 Revolving Credit Facility, Due Nov. 2016 [Member] Daily Euro Rate [Member] Minimum [Member]	Sep. 30, 2014 Revolving Credit Facility, Due Nov. 2016 [Member] Daily Euro Rate [Member] Maximum [Member]	Sep. 30, 2014 Letters of Credit [Member] USD ($)	Dec. 31, 2013 Letters of Credit [Member] USD ($)
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity														$ 350,000,000
Debt instrument maturity date											Oct. 15, 2020		Nov. 21, 2016		Nov. 30, 2016
Federal fund rate spread										0.50%						0.25%	1.25%	1.25%	2.25%
Margin over Euro-rate		1.00%
Leverage ratio	2.3								3.5
Aggregate principal amount				57,600,000	42,700,000		12,600,000	10,000,000				250,000,000
Percentage of aggregate principal amount of outstanding			2.05%			2.40%					5.375%	5.375%
Frequency of interest payable											Semiannually
Debt instrument redemption											The 5.375% Notes are redeemable, in whole or in part, at anytime on or after October 15, 2016 at the redemption prices specified in the applicable Indenture. Prior to October 15, 2016, we may redeem some or all of the Notes at a "make-whole" premium as specified in the Indenture.
Number of separate loan agreement			2
Number of installments			32			27
Installments beginning date			Jun. 30, 2015			Sep. 30, 2015
Installments ending date			Mar. 31, 2023			Jun. 30, 2022
Letters of credit issued																				5,200,000	5,200,000
Letters of credit outstanding																				$ 0

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Amount of Letters of Credit Issued and Reducing Availability under Revolving Credit Facility

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Debt Instrument Loan Agreement Number

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Debt instrument number of installment payment.

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Ratio of EBITDA over net debt.

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Loan repayable installments start date.

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Margin over Euro-rate.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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