Derivatives and Financial Instruments - Additional Information (Detail)	3 Months Ended				1 Months Ended			1 Months Ended		3 Months Ended		12 Months Ended	1 Months Ended	3 Months Ended		12 Months Ended
	Mar. 31, 2012 USD ($)	Apr. 02, 2011 USD ($)	May 12, 2011 CPT USD ($)	May 12, 2011 CPT EUR (€)	May 31, 2011 Foreign Currency Option Contract USD ($)	Mar. 31, 2011 Foreign Currency Option Contract EUR (€)	Apr. 02, 2011 Fair Value, Measurements, Recurring USD ($)	Apr. 30, 2011 Interest Rate Swap USD ($)	Aug. 31, 2007 August 2007 Interest Rate Swap Agreement USD ($)	Mar. 31, 2012 August 2007 Interest Rate Swap Agreement USD ($)	Apr. 02, 2011 August 2007 Interest Rate Swap Agreement USD ($)	Dec. 31, 2011 August 2007 Interest Rate Swap Agreement USD ($)	Sep. 30, 2005 September 2005 Interest Rate Swap Agreement USD ($)	Mar. 31, 2012 September 2005 Interest Rate Swap Agreement USD ($)	Apr. 02, 2011 September 2005 Interest Rate Swap Agreement USD ($)	Dec. 31, 2011 September 2005 Interest Rate Swap Agreement USD ($)
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional amount of interest rate swap agreement								$ 400,000,000	$ 105,000,000				$ 100,000,000
Effective date of the fixed rate swap									Aug. 30, 2007				Apr. 25, 2006
Fixed interest rate paid									4.89%				4.68%
Swap agreement expiration									2012-05				2013-07
Effective fixed rate paid on debt									5.39%				5.28%
Fair value of the swap										600,000	5,300,000	1,700,000		5,500,000	8,300,000	6,300,000
Location of the swap on the Consolidated Balance Sheets	Unrealized income/expense is included in AOCI									Accumulated other comprehensive income (loss) ("AOCI")	Accumulated other comprehensive income (loss) ("AOCI")	Accumulated other comprehensive income (loss) ("AOCI")		AOCI	AOCI	AOCI
Interest rate spread over LIBOR									0.50%				0.60%
Incremental expense resulting from interest rate swaps	2,200,000	2,400,000
Variable interest payments per the underlying debt										variable interest rates of 3 month LIBOR plus .50% for $105 million of debt				3 month LIBOR plus .60% for $100 million of debt
Spread added to variable interest rates of 3 month LIBOR										0.50%				0.60%
Fair value measurement inputs classified as Level 2	Our interest rate swaps are carried at fair value measured on a recurring basis. Fair values are determined through the use of models that consider various assumptions, including time value, yield curves, as well as other relevant economic measures, which are inputs that are classified as Level 2 in the valuation hierarchy defined by the accounting guidance.
Average swap interest rate								3.65%
Cost of expiration (termination)								11,000,000
Foreign currency option fluctuations related to acquisition						We entered into a foreign currency option contract to reduce our exposure to fluctuations in the euro related to our €503 million acquisition of CPT.
Business acquisition purchase price			715,300,000	502,700,000
Notional amount of foreign currency contract						286,000,000
Foreign currency contract maturity date						May 13, 2011
Foreign currency contract strike price						1.4375
Foreign currency contract - Assets							2,817,000
Sale of foreign currency option contract					1,000,000
Net cost of option contract					$ (2,100,000)