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Acquisition - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 28, 2013
May 13, 2013
Challenger Lifts Inc [Member]
Business Acquisition [Line Items]    
Acquisition of ownership interest   100.00%
Preliminary cash purchase price of acquisition $ 38.2 $ 38.2