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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
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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For an unclassified balance sheet, amounts due from parties associated with the reporting entity as evidenced by a written promise to pay.

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-Publisher FASB
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Fair value portion of receivables, including, but not limited to, trade account receivables, note receivables, and loan receivables.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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