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Net Income Per Common Share - Additional Information (Detail) - shares shares in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net Income Loss Per Common Share
Exercise of stock options	0.2	0.3	0.4

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- Definition

Net Income (Loss) Per Common Share [Line Items]

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No definition available.

+ Details

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- Definition

Stock Issued During Period Shares Sale Of Stock And Exercise Of Stock Options

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No definition available.

+ Details

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