Other Matters - Additional Information (Detail) (Automated Laser Fabrication Co., LLC ("ALF") [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Automated Laser Fabrication Co., LLC ("ALF") [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ 0.8
Equity method investment, ownership percentage	38.00%

This element represents the aggregate cost of investments accounted for under the equity method of accounting.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 12

-Article 5

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