Significant Accounting Policies - Additional Information (Detail)	1 Months Ended	3 Months Ended
Jan. 31, 2013	Mar. 31, 2012 Positions
Accounting Policies [Abstract]
Number of positions outsourced to third party		140
Medical device excise tax	2.30%

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