Amount of tax expense (benefit) for an increase (decrease) to a gain (loss) previously reported in discontinued operations in a prior period.

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Name:	us-gaap_DiscontinuedOperationTaxEffectOfAdjustmentToPriorPeriodGainLossOnDisposal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Components of Income from Discontinued Operations (Parenthetical) (Detail) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014
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