Summary of Restructuring Activity (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	$ 1,043	$ 4,869
Restructuring costs		(62)	8,064
Cash payments	(602)	(3,764)	(3,818)
Other			623	[1]
Restructuring reserve, ending balance	441	1,043	4,869
Personnel
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	243	2,752
Restructuring costs			6,501
Cash payments	(243)	(2,509)	(3,749)
Restructuring reserve, ending balance		243	2,752
Facility Closing
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	800	2,117
Restructuring costs		(62)	1,563
Cash payments	(359)	(1,255)	(69)
Other			623	[1]
Restructuring reserve, ending balance	$ 441	$ 800	$ 2,117

[1] Reflects the liability initially recorded for the acquired above market operating lease terms at acquisition, which was subsequently restructured.