Restructuring and Other Charges - Movements in Restructuring and Related Accruals (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2010
Restructuring Reserve [Roll Forward]
Balance	$ 2,116		$ 3,149			$ 10,774
Additional charges (reversals), net	6,398		7,401		1,668
Non-cash charges	(5,100)		(5,250)		(292)
Payments and other costs	(2,655)		(3,184)		(9,001)
Balance	759		2,116		3,149	10,774
Employee-Related [Member]
Restructuring Reserve [Roll Forward]
Balance	2,116	[1]	3,149			10,774
Additional charges (reversals), net	(46)		2,151		1,376
Non-cash charges			0		0
Payments and other costs	(1,311)		(3,184)		(9,001)
Balance	759		2,116	[1]	3,149	10,774
Pension [Member]
Restructuring Reserve [Roll Forward]
Balance	0		0			0
Additional charges (reversals), net	0		0		292
Non-cash charges	0		0		(292)
Payments and other costs	0		0		0
Balance	0		0		0	0
Asset - Related/and Other [Member]
Restructuring Reserve [Roll Forward]
Balance	0		0			0
Additional charges (reversals), net	6,444		5,250		0
Non-cash charges	(5,100)		(5,250)		0
Payments and other costs	(1,344)		0		0
Balance	$ 0		$ 0		$ 0	$ 0

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