Schedule of Compensation Cost for Stock Options and Unvested Shares (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Total expense before income taxes			$ 8,176	$ 10,082
Stock Option
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Total expense before income taxes	1,651	2,138	3,910	4,426
Income tax benefit	(492)	(716)	(1,200)	(1,452)
Total expense after income taxes	1,159	1,422	2,710	2,974
Stock Option | Cost Of Goods Sold
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Total expense before income taxes	189	208	482	443
Stock Option | Selling, General And Administrative Expenses
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Total expense before income taxes	1,462	1,930	3,428	3,983
Unvested Shares
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Total expense before income taxes	1,864	3,095	4,266	5,656
Income tax benefit	(477)	(582)	(1,140)	(1,086)
Total expense after income taxes	1,387	2,513	3,126	4,570
Unvested Shares | Cost Of Goods Sold
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Total expense before income taxes	197	150	603	298
Unvested Shares | Selling, General And Administrative Expenses
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Total expense before income taxes	$ 1,667	$ 2,945	$ 3,663	$ 5,358