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Long-term Incentive Plan - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Mar. 01, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Performance cycle assessed period 3 years      
Charge for the LTIP   $ 5.3 $ 8.7 $ 0.0