Commitments And Contingencies (Detail) (USD $)	1 Months Ended			12 Months Ended
	Dec. 31, 2010	Mar. 31, 2010	Nov. 30, 2007 acre	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Oct. 31, 2010	Apr. 20, 2010
Commitments And Contingencies [Line Items]
Lease expense incurred				$ 2,900,000	$ 3,700,000	$ 3,300,000
Future annual minimum lease commitments for the year 2013				1,700,000
Future annual minimum lease commitments for the year 2014				900,000
Future annual minimum lease commitments for the year 2015				445,000
Future annual minimum lease commitments for the year 2016				220,000
Future annual minimum lease commitments for the year 2017				192,000
Future annual minimum lease commitments for the year, thereafter				1,700,000
Approximate acres of vacant land used for lease agreement			11
Expiration of lease agreement (years)			30 years
Additional extension of lease term			13 years	13 years
General liability coverage							200,000,000	100,000,000
Tax assessment settled with payments	3,900,000	12,200,000
Amount of interest, penalties and monetary restatement fees on tax assessments				7,800,000
Value of Brazilian subsidiary served with assessments				13,000,000
ATP [Member]
Commitments And Contingencies [Line Items]
Receivables from bankruptcy				1,400,000
Customer prepayments				4,300,000
Provision for loss due to bankruptcy				$ 0