New Financial Accounting Pronouncements - Additional Information (Detail) $ in Millions	12 Months Ended
Dec. 31, 2014 USD ($)
Accounting Changes And Error Corrections [Abstract]
Reclassified from deferred charges and other assets to debt, less current portion	$ 0.6

The amount of a reclassification adjustment made to prior period financial statement amounts.

No definition available.

Name:	us-gaap_PriorPeriodReclassificationAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration