Unaudited Quarterly Results of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended									12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Quarterly Results Of Operations [Line Items]
Net sales	$ 490,838	[1]	$ 479,859	$ 494,144	$ 489,417	$ 480,683	$ 476,881	$ 453,798	$ 427,089	$ 1,954,258		$ 1,838,451		$ 1,513,073
Gross profit	202,858	[1]	194,840	203,113	202,889	193,602	181,532	184,839	178,700	803,700		738,673		618,483
Operating income (loss)	(125,589)	[1]	80,588	88,650	84,569	76,001	71,305	79,629	77,721	128,218	[2]	304,656	[2]	249,116	[2]
Net income (loss)	$ (119,019)	[1]	$ 50,127	$ 54,351	$ 52,171	$ 47,388	$ 48,336	$ 50,182	$ 47,951	$ 37,630		$ 193,857		$ 157,100
Basic EPS	$ (1.45)	[1]	$ 0.60	$ 0.65	$ 0.63	$ 0.57	$ 0.58	$ 0.61	$ 0.58	$ 0.45		$ 2.34		$ 1.93
Diluted EPS	$ (1.45)	[1]	$ 0.60	$ 0.65	$ 0.62	$ 0.57	$ 0.58	$ 0.60	$ 0.57	$ 0.45		$ 2.32		$ 1.90
Basic weighted average shares outstanding	82,296	[1]	82,482	83,180	82,804	82,596	82,402	82,151	81,430	82,689		82,145		80,466
Diluted weighted average shares outstanding	82,296	[1]	83,370	84,090	83,902	83,573	83,586	83,778	83,248	83,641		83,543		81,983

[1] Fourth quarter 2012 includes a $198.5 million asset impairment charge.

[2] Segment operating income excludes net unallocated corporate operating expenses.