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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Derivative Instruments And Hedging Activities Disclosure [Abstract]    
Carrying amount of notes $ 441.0 $ 437.6
Level 3 [Member]    
Derivative Instruments And Hedging Activities Disclosure [Abstract]    
Approximate fair value of notes $ 444.5 $ 441.5