The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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Long-Term Debt - Additional Information (Detail)					3 Months Ended			0 Months Ended	3 Months Ended
Long-Term Debt - Additional Information (Detail)	Mar. 31, 2015 USD ($)	Jan. 15, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2014 EUR (€)	Mar. 31, 2015 Revolving Credit Facility [Member] USD ($)	Dec. 31, 2014 Revolving Credit Facility [Member] USD ($)	Aug. 30, 2010 Revolving Credit Facility [Member] USD ($)	Aug. 30, 2010 Term Loan Facility [Member] USD ($)	Mar. 31, 2015 Term Loan Facility [Member]
Debt Instrument [Line Items]
Debt instrument term (in years)					5 years				5 years
Maximum borrowing capacity	$ 6,200,000		$ 7,000,000	€ 5,800,000			$ 200,000,000
Maximum borrowing capacity								100,000,000
Available capacity under the revolving credit facility		100,000,000
Amount outstanding under lines of credit	0us-gaap_LineOfCredit				0	0
Revolving credit facility due date					Aug. 30, 2015
Amount of restricted net assets	184,100,000		181,800,000
Restricted cash	$ 27,253,000		$ 34,424,000