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Segment Information - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Segment
Dec. 31, 2014
Segment
Dec. 31, 2013
Segment
Segment Reporting Information [Line Items]      
Number of Reportable Segments | Segment 2 0 0
RANA      
Segment Reporting Information [Line Items]      
Capital expenditures $ 19.4    
RAEU      
Segment Reporting Information [Line Items]      
Capital expenditures $ 6.6