Restructuring and Other Special Charges - Additional Information (Detail)	12 Months Ended
Dec. 31, 2014 Employee	Dec. 31, 2013 Person
Restructuring Cost and Reserve [Line Items]
Number of Associates notified	1,000
Restructuring November 2012 Plan
Restructuring Cost and Reserve [Line Items]
Number of Associates notified		400

The number of positions eliminated during the period as a result of restructuring activities.

No definition available.

Name:	us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration