Long-Term Debt - Additional Information (Detail) (USD $)					1 Months Ended				1 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Mar. 31, 2012 7 1/4% Senior Notes	Mar. 23, 2012 5% Senior Notes	Mar. 31, 2012 5% Senior Notes	Mar. 23, 2012 5% Senior Notes Prior to April One Twenty Fifteen	Mar. 23, 2012 5% Senior Notes Prior to April One Twenty Sixteen	Apr. 09, 2012 Repayment of Debt 7 1/4% Senior Notes	Mar. 31, 2012 Bank debt Revolving and term loans Other foreign
Line of Credit Facility [Line Items]
Long-term debt, current	$ 331,008,000	$ 87,776,000	$ 520,285,000	$ 245,500,000						$ 85,500,000
Debt instrument, maturity year				2016
Senior subordinated note principal amount redeemed									250,000,000
Aggregate principal amount of notes issued					500,000,000
Redemption price as percentage of principal amount							105.00%	100.00%	112.3715%
Redemption price paid									280,900,000
Debt instrument, stated interest rate					5.00%	5.00%			7.25%
Pre-tax charge for loss on early extinguishment of debt									$ (38,700,000)
Issue price as percentage of principal amount					100.00%
Description of the debt instrument interest payment					Interest on the 5% Notes is payable semi-annually in cash on April 1 and October 1 of each year, and the 5% Notes mature on April 1, 2020.
Debt instrument, maturity date					Apr. 01, 2020
Debt instrument, redemption date							Apr. 01, 2015	Apr. 01, 2016
Debt Instrument, redemption percentage with equity offering proceeds, maximum							35.00%
Redemption price as percentage of principal amount upon the occurrence of change of control					101.00%