New Accounting Standards - Additional Information (Detail) $ in Millions	Dec. 31, 2016 USD ($)
New Accounting Pronouncement, Early Adoption, Effect [Member]
New Accounting Pronouncement Early Adoption [Line Items]
Reduction in other assets and long-term debt	$ 6.2

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Balance Type:	na
Period Type:	duration