Company - Additional Information (Detail) (W.E.T.) In Thousands, except Share data, unless otherwise specified	1 Months Ended
Feb. 22, 2013 USD ($)	Feb. 22, 2013 EUR (€)	May 07, 2013 W.E.T. Bank of America credit facility Subsequent Event USD ($)	May 07, 2013 W.E.T. Bank of America credit facility Subsequent Event EUR (€)
Nature Of Company [Line Items]
Business Acquisition, shares acquired	442,253	442,253	308,400	308,400
Business Acquisition, percentage of shares acquired	14.00%	14.00%
Business Acquisition, shares issued for acquisition	3,300,000	3,300,000
Business Acquisition, cash paid	$ 7,247	€ 5,408	$ 35,127	€ 26,214
Business Acquisition, percentage of shares acquired			99.00%	99.00%
Business Acquisition, purchase price per share				€ 85
Business Acquisition cost of acquisition, financed by borrowings			$ 40,441

Amount of cash paid to acquire the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph f(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaid
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant