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						9 Months Ended
	Dec. 31, 2013	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2013
Restructuring Reserve [Roll Forward]
Restructuring payable, Beginning balance		$ 1,064	$ 1,476	$ 3,307	$ 1,207	$ 2,668	$ 5,122	$ 5,122
Charges to cost and expense	70,600				1,858	4,998	3,509	10,365
Non-cash items					(675)	(3,736)	(1,699)
Cash payments		(357)	(412)	(1,831)	(714)	(2,723)	(4,264)
Restructuring payable, Ending balance	3,307	707	1,064	1,476	1,676	1,207	2,668	1,676
Workforce Reductions
Restructuring Reserve [Roll Forward]
Restructuring payable, Beginning balance		121	330	806	1,100	2,075	4,531	4,531
Charges to cost and expense					602	677	1,091
Non-cash items					0	0	0
Cash payments		(97)	(209)	(476)	(669)	(1,652)	(3,547)
Restructuring payable, Ending balance		24	121	330	1,033	1,100	2,075	1,033
Transition Costs
Restructuring Reserve [Roll Forward]
Restructuring payable, Beginning balance		943	1,146	2,501	107	593	591	591
Charges to cost and expense					1,256	997	2,418
Non-cash items					(675)	(412)	(1,699)
Cash payments		(260)	(203)	(1,355)	(45)	(1,071)	(717)
Restructuring payable, Ending balance		683	943	1,146	643	107	593	643
Asset Write-offs
Restructuring Reserve [Roll Forward]
Restructuring payable, Beginning balance		0	0	0	0	0	0	0
Charges to cost and expense					0	3,324	0
Non-cash items					0	(3,324)	0
Cash payments		0	0	0	0	0	0
Restructuring payable, Ending balance		$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0