Restructuring and Other - Restructuring and Other Reserve Activities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Restructuring And Related Activities [Abstract]
Reserve balance at January 1,			$ 1,670	$ 1,870	$ 1,870
Restructuring charges			1,084	785
Other charges			2,053	1,465
Non-cash acquisition-related retention costs	(200)	(200)	(465)	(456)	(907)
Cash payments			(3,006)	(2,152)
Reserve balance at June 30,	$ 1,336	$ 1,512	$ 1,336	$ 1,512	$ 1,670