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Variable Interest Entity ("VIE") - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended
Apr. 12, 2013
Mar. 31, 2014
Oct. 02, 2013
Apr. 26, 2013
Mar. 18, 2013
Variable Interest Entity [Line Items]          
Equity investment at risk   $ 9.0 $ 3.5 $ 1.9 $ 3.1
Capital contribution made by non controlling interest   0.5      
Maximum capital contributions amount by company   8.5      
Maximum capital contributions amount by minority interest   0.5      
Capital contribution made by company   8.50 3.50 1.85 3.15
Carrying value of investment   5.1      
Investment   8.7      
Cash collateral letter of credit issued 0.2        
Letter of credit expiration date Apr. 15, 2014 Apr. 15, 2015      
Goodwill   $ 3.4