Inventories - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]
Inventory pending approval by U.S. Food and Drug Administration or other regulatory agencies	$ 89.2	$ 49.7

Inventory pending approval by regulatory agencies.

No definition available.

Name:	act_InventoryPendingApprovalByRegulatoryAgencies
Namespace Prefix:	act_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant