Derivatives and Hedging (Detail) - Outstanding Derivatives Contracts (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2012		Dec. 31, 2011
Number of Outstanding Contracts	31		63
Contract Notional Amount	$ 240,530		$ 330,335
Fair Value Asset (Liability)	(11,240)	[1]	(9,717)	[1]
OCI Unrealized (Loss), Net Of Tax	(6,617)		(5,934)
Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Interest Rate Swap [Member]
Number of Outstanding Contracts	1	[2]	1	[2]
Contract Notional Amount	200,000	[2]	200,000	[2]
Fair Value Asset (Liability)	(11,000)	[1],[2]	(9,891)	[1],[2]
OCI Unrealized (Loss), Net Of Tax	(6,617)	[2]	(5,934)	[2]
Other Liabilities [Member] | Interest Rate Swap [Member]
Number of Outstanding Contracts			2	[3]
Contract Notional Amount			30,750	[3]
Fair Value Asset (Liability)			(98)	[1],[3]
OCI Unrealized (Loss), Net Of Tax				[3]
Accrued Liabilities Current [Member] | Foreign Currency Forward Contracts, Net [Member]
Number of Outstanding Contracts	30	[4]
Contract Notional Amount	40,530	[4]
Fair Value Asset (Liability)	(240)	[1],[4]
OCI Unrealized (Loss), Net Of Tax		[4]
Other Current Assets [Member] | Foreign Currency Forward Contracts, Net [Member]
Number of Outstanding Contracts			60	[4]
Contract Notional Amount			99,585	[4]
Fair Value Asset (Liability)			272	[1],[4]
OCI Unrealized (Loss), Net Of Tax				[4]

[1] See Note 11 - Fair Value Disclosures for the determination of the fair value of these instruments.

[2] The Company has designated this swap as a cash flow hedge of the forecasted interest payments on borrowings (see Note 7 - Debt). As a result, changes in fair value of this swap are deferred and are recorded in OCI, net of tax effect.

[3] These swaps matured in January 2012. Changes in the fair value of these swaps were recognized in earnings.

[4] The Company has foreign exchange transaction risk since it typically enters into transactions in the normal course of business that are denominated in foreign currencies that differ from the local functional currency. The Company enters into short-term foreign currency forward exchange contracts to offset the economic effects of these foreign currency transaction risks. These contracts are accounted for at fair value with realized and unrealized gains and losses recognized in Other expense, net since the Company does not designate these contracts as hedges for accounting purposes. Substantially all of the outstanding contracts at September 30, 2012 matured by the end of October 2012.