Cost Reduction Initiatives - Activity and Liability Balances Recorded as Part of Initiatives as well as Current Estimated Future Charges Relating Initiatives (Detail) (Cost Reduction Initiatives, USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended
	Dec. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Restructuring Cost And Reserve [Line Items]
Restructuring payable, Beginning balance		$ 3,307	$ 5,122
Charges to cost and expense	70,600		3,509
Non-cash items			(1,699)
Cash payments		(1,831)	(4,264)
Restructuring payable, Ending balance	3,307	1,476	2,668
Workforce Reductions
Restructuring Cost And Reserve [Line Items]
Restructuring payable, Beginning balance		806	4,531
Charges to cost and expense			1,091
Non-cash items			0
Cash payments		(476)	(3,547)
Restructuring payable, Ending balance		330	2,075
Transition Costs
Restructuring Cost And Reserve [Line Items]
Restructuring payable, Beginning balance		2,501	591
Charges to cost and expense			2,418
Non-cash items			(1,699)
Cash payments		(1,355)	(717)
Restructuring payable, Ending balance		1,146	593
Asset Write-offs
Restructuring Cost And Reserve [Line Items]
Restructuring payable, Beginning balance		0	0
Charges to cost and expense			0
Non-cash items			0
Cash payments		0	0
Restructuring payable, Ending balance		$ 0	$ 0