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Condensed Statements of Income (Loss) and Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
As Restated [Member]    
Condensed Financial Statements, Captions [Line Items]    
Net income loss, period increase (decrease) $ (1.4) $ (2.5)