Cost Reduction Initiatives - Activity and Liability Balances Recorded as Part of Initiatives as well as Current Estimated Future Charges Relating Initiatives (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended				9 Months Ended		15 Months Ended	3 Months Ended			9 Months Ended	3 Months Ended			9 Months Ended	3 Months Ended			9 Months Ended
	Jul. 31, 2012	Sep. 30, 2013 Cost Reduction Initiatives	Jun. 30, 2013 Cost Reduction Initiatives	Mar. 31, 2013 Cost Reduction Initiatives	Sep. 30, 2012 Cost Reduction Initiatives	Sep. 30, 2013 Cost Reduction Initiatives	Sep. 30, 2012 Cost Reduction Initiatives	Sep. 30, 2013 Cost Reduction Initiatives	Sep. 30, 2013 Cost Reduction Initiatives Workforce Reductions	Jun. 30, 2013 Cost Reduction Initiatives Workforce Reductions	Mar. 31, 2013 Cost Reduction Initiatives Workforce Reductions	Sep. 30, 2013 Cost Reduction Initiatives Workforce Reductions	Sep. 30, 2013 Cost Reduction Initiatives Transition Costs	Jun. 30, 2013 Cost Reduction Initiatives Transition Costs	Mar. 31, 2013 Cost Reduction Initiatives Transition Costs	Sep. 30, 2013 Cost Reduction Initiatives Transition Costs	Sep. 30, 2013 Cost Reduction Initiatives Asset Write-offs	Jun. 30, 2013 Cost Reduction Initiatives Asset Write-offs	Mar. 31, 2013 Cost Reduction Initiatives Asset Write-offs	Sep. 30, 2013 Cost Reduction Initiatives Asset Write-offs
Restructuring Cost And Reserve [Line Items]
Restructuring payable, Beginning balance		$ 1,207	$ 2,668	$ 5,122		$ 5,122			$ 1,100	$ 2,075	$ 4,531	$ 4,531	$ 107	$ 593	$ 591	$ 591	$ 0	$ 0	$ 0	$ 0
Charges to cost and expense		1,858	4,998	3,509	35,084	10,365	39,755	64,426	602	677	1,091		1,256	997	2,418		0	3,324	0
Non-cash items		(675)	(3,736)	(1,699)					0	0	0		(675)	(412)	(1,699)		0	(3,324)	0
Cash payments		(714)	(2,723)	(4,264)					(669)	(1,652)	(3,547)		(45)	(1,071)	(717)		0	0	0
Restructuring payable, Ending balance		1,676	1,207	2,668		1,676		1,676	1,033	1,100	2,075	1,033	643	107	593	643	0	0	0	0
Total future estimated charges, at end of period	$ 68,000					$ 3,000						$ 700				$ 2,300				$ 0