Cost Reduction Initiatives - Activity and Liability Balances Recorded as Part of Initiatives as well as Current Estimated Future Charges Relating Initiatives (Detail) (USD $)	1 Months Ended	6 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended	3 Months Ended		6 Months Ended	3 Months Ended		6 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2012	Jun. 30, 2013	Jun. 30, 2013 Cost Reduction Initiatives	Mar. 31, 2013 Cost Reduction Initiatives	Jun. 30, 2012 Cost Reduction Initiatives	Jun. 30, 2013 Cost Reduction Initiatives	Jun. 30, 2012 Cost Reduction Initiatives	Jun. 30, 2013 Cost Reduction Initiatives	Jun. 30, 2013 Cost Reduction Initiatives Workforce Reductions	Mar. 31, 2013 Cost Reduction Initiatives Workforce Reductions	Jun. 30, 2013 Cost Reduction Initiatives Workforce Reductions	Jun. 30, 2013 Cost Reduction Initiatives Transition Costs	Mar. 31, 2013 Cost Reduction Initiatives Transition Costs	Jun. 30, 2013 Cost Reduction Initiatives Transition Costs	Jun. 30, 2013 Cost Reduction Initiatives Asset Write-offs	Mar. 31, 2013 Cost Reduction Initiatives Asset Write-offs	Jun. 30, 2013 Cost Reduction Initiatives Asset Write-offs
Restructuring Cost And Reserve [Line Items]
Restructuring payable, Beginning balance			$ 2,668,000	$ 5,122,000		$ 5,122,000			$ 2,075,000	$ 4,531,000	$ 4,531,000	$ 593,000	$ 591,000	$ 591,000	$ 0	$ 0	$ 0
Charges to cost and expense			4,998,000	3,509,000	4,643,000	8,507,000	4,671,000	62,568,000	677,000	1,091,000		997,000	2,418,000		3,324,000	0
Non-cash items			(3,736,000)	(1,699,000)					0	0		(412,000)	(1,699,000)		(3,324,000)	0
Cash payments			(2,723,000)	(4,264,000)					(1,652,000)	(3,547,000)		(1,071,000)	(717,000)		0	0
Restructuring payable, Ending balance			1,207,000	2,668,000		1,207,000		1,207,000	1,100,000	2,075,000	1,100,000	107,000	593,000	107,000	0	0	0
Total future estimated charges, at end of period	$ 65,000,000	$ 2,400,000				$ 2,400,000					$ 700,000			$ 1,700,000			$ 0