Condensed Consolidated Statements of Operations (Parenthetical) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Tax expense on gain from discontinued operations and disposal	$ 1,600,000.0	$ 0	$ 1,600,000.0	$ 0

Amount of tax expense (benefit) on gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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