Supplier Concentration (Details)				12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Supplier Concentration Risk [Member]	Dec. 31, 2011 Supplier Concentration Risk [Member] Carrier Corporation [Member]	Dec. 31, 2010 Supplier Concentration Risk [Member] Carrier Corporation [Member]	Dec. 31, 2009 Supplier Concentration Risk [Member] Carrier Corporation [Member]
Concentration Risk [Line Items]
Number of key suppliers				4
Percentage of purchases from key suppliers	71.00%	72.00%	66.00%		54.00%	52.00%	41.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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

-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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