Post-Retirement Benefits - Additional Information (Detail) (Unfunded Pension Plan, USD $)	Sep. 30, 2013
Unfunded Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Pension liability	$ 8.9

This represents the noncurrent liability recognized in the balance sheet that is associated with the defined benefit pension plans.

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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant