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Long-Term Debt - Additional Information (Detail)	0 Months Ended	12 Months Ended					12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended
	Oct. 03, 2012 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2013 IKB Loan [Member] Installment	Apr. 11, 2013 IKB Loan [Member] USD ($)	Apr. 11, 2013 IKB Loan [Member] EUR (€)	Dec. 31, 2013 Maximum [Member]	Dec. 31, 2013 Federal Funds Rate [Member]	Dec. 31, 2013 Other Assets [Member] USD ($)	Dec. 31, 2013 5.375% Notes [Member] USD ($)	Dec. 31, 2012 5.375% Notes [Member]	Oct. 03, 2012 5.375% Notes [Member] USD ($)	Dec. 31, 2013 7.125% Notes, Due May 2016 [Member] USD ($)	Dec. 31, 2013 Revolving Credit Facility [Member]	Nov. 21, 2011 Revolving Credit Facility [Member] USD ($)	Dec. 31, 2013 Revolving Credit Facility, Due Nov. 2016 [Member] Minimum [Member]	Dec. 31, 2013 Revolving Credit Facility, Due Nov. 2016 [Member] Maximum [Member]	Dec. 31, 2013 Revolving Credit Facility, Due Nov. 2016 [Member] Daily Euro Rate [Member] Minimum [Member]	Dec. 31, 2013 Revolving Credit Facility, Due Nov. 2016 [Member] Daily Euro Rate [Member] Maximum [Member]	Dec. 31, 2013 Letter of Credit [Member] USD ($)	Dec. 31, 2012 Letter 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
Federal fund rate spread								0.50%								0.25%	1.25%	1.25%	2.25%
Margin over Euro-rate		1.00%
Leverage ratio		2.2					3.5
Aggregate principal amount					57,600,000	42,700,000						250,000,000
Percentage of aggregate principal amount of outstanding		5.375%	5.375%	2.05%						5.375%	5.375%	5.375%	7.125%
Proceeds from note offering, net of original issue discount			250,000,000							245,100,000			200,000,000
Redemption rate	102.375%
Redemption premium	4,800,000
Write-off of the related unamortized deferred financing fees	1,900,000
Frequency of interest payable										Semiannually
Number of installments				32
Installments beginning date				Jun. 30, 2015
Installments ending date				Mar. 31, 2023
Aggregated unamortized deferred debt issuance costs									6,400,000
Amortization expense related to deferred debt issuance costs		1,300,000
Letter of credit outstanding																				$ 5,200,000	$ 4,600,000

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

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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 end date.

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Margin over Euro-rate.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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

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Description of the frequency of periodic payments (monthly, quarterly, annual).

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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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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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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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