Pre-Tax Charges and Changes in Restructuring Reserves (Detail) (USD $) In Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Restructuring Reserve Disclosures [Abstract]
Beginning Reserve	$ 2,052	$ 672
Charges during period	453	8,371
Cash Paid	(1,809)	(2,800)
Ending Reserve	696	2,052
Non Cash Items | Employee Severance
Restructuring Reserve Disclosures [Abstract]
Beginning Reserve		0
Charges during period		3,266
Cash Paid		0
Ending Reserve		0
Non Cash Items | Other Restructuring
Restructuring Reserve Disclosures [Abstract]
Beginning Reserve		0
Charges during period		925
Cash Paid		0
Ending Reserve		0
Employee Severance
Restructuring Reserve Disclosures [Abstract]
Beginning Reserve	1,835	666
Charges during period	304	3,100
Cash Paid	(1,476)	(1,931)
Ending Reserve	663	1,835
Other Restructuring
Restructuring Reserve Disclosures [Abstract]
Beginning Reserve	217	6
Charges during period	149	1,080
Cash Paid	(333)	(869)
Ending Reserve	$ 33	$ 217