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Components of Income (Loss) from Discontinued Operations (Parenthetical) (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Discontinued Operations And Disposal Groups [Abstract]
Income (loss) from discontinued operations, income taxes
Adjustments to amounts reported previously for gain on sale of discontinued operations, income taxes
Gain on sale of discontinued operations, income taxes					$ 0

Tax effect of adjustment to an amount previously reported in discontinued operations that is directly related to the disposal of the component in a prior period. Examples of circumstances leading to such adjustments include the resolution of contingencies relating to the terms of the disposal transaction or relating to the operations of the component prior to its disposal, and the settlement of certain employee benefit plan obligations.

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