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Investments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended			3 Months Ended				9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 Finland	Mar. 31, 2011 Finland	Sep. 30, 2012 Finland	Dec. 31, 2011 Finland	Sep. 30, 2012 Australia	Sep. 30, 2011 Australia	Dec. 31, 2011 Australia	Dec. 31, 2008 Australia
Investment [Line Items]
Percentage of equity investment						25.00%					50.00%
Dividend received from investment in Finland				$ 728	$ 443
Carrying value of the investment	1,159		1,183			441	688	718		495
Expense for additional working capital requirements relating to the Australian investment	$ 2,077	$ 2,559						$ 2,077	$ 2,559

This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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