Restructuring, Asset Impairment Charges and Other Items - Summary of Significant Activity Within and Components of Restructuring Obligations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Restructuring Expense And Other Items Net [Line Items]
Beginning Balance	$ 22,196		$ 25,856
Expense	22,992		57,318
Utilized	(27,194)		(60,978)
Ending Balance	17,994		22,196
Employee Severance and Benefits [Member]
Restructuring Expense And Other Items Net [Line Items]
Beginning Balance	10,444		4,951
Expense	8,145		26,754
Utilized	(13,586)	[1]	(21,261)	[1]
Ending Balance	5,003	[2]	10,444
Lease and Contract Terminations [Member]
Restructuring Expense And Other Items Net [Line Items]
Beginning Balance	11,752		20,905
Expense	10,306		8,303
Utilized	(9,067)	[1]	(17,456)	[1]
Ending Balance	12,991	[2]	11,752
Other exit costs [Member]
Restructuring Expense And Other Items Net [Line Items]
Beginning Balance
Expense	4,541		22,261
Utilized	(4,541)		(22,261)
Ending Balance

[1] Represents cash payments.

[2] The balance remaining for the lease terminations is expected to be paid during the remaining terms of the leases, which extend through 2014. The majority of the balance remaining for employee severance and benefits is expected to be paid by the first quarter of 2013.