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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
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Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Carrying amount of notes | $ 447.5 | $ 437.6
Level 3 [Member] |  |
Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Approximate fair value of notes | $ 450.0 | $ 441.5

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