Schedule of Quarterly Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 291,429		$ 264,884		$ 285,859		$ 269,886		$ 282,341		$ 270,480		$ 279,367		$ 278,255		$ 1,112,058		$ 1,110,443		$ 1,112,814
Gross profit	130,050		115,426		129,665		121,704		128,242		118,391		119,538		123,377		496,845		489,548
Continuing operations	24,929		18,987		23,315		18,627		19,216		18,173		27,078		23,090		85,858		87,557		67,518
Income from continuing operations, Basic (dollars per share)	$ 0.67	[1]	$ 0.51	[1]	$ 0.63	[1]	$ 0.50	[1]	$ 0.52	[1]	$ 0.49	[1]	$ 0.74	[1]	$ 0.63	[1]	$ 2.31	[1]	$ 2.37	[1]	$ 1.85
Income from continuing operations, Diluted (dollars per share)	$ 0.66	[1]	$ 0.51	[1]	$ 0.62	[1]	$ 0.49	[1]	$ 0.51	[1]	$ 0.48	[1]	$ 0.73	[1]	$ 0.62	[1]	$ 2.28	[1]	$ 2.34	[1]	$ 1.81
Net Sales	12,142		13,361		13,836		13,353		11,773		16,087		15,371		15,230		52,692		58,461		60,414
Gross profit	2,428		2,790		3,215		3,078		2,119		3,863		3,588		3,614		11,511		13,184
Income from discontinued operations	$ 482		$ 514		$ 734		$ 659		$ 271		$ 1,060		$ 917		$ 832		$ 2,389		$ 3,080		$ 2,334
Income from discontinued operations, Basic (dollars per share)	$ 0.01	[1]	$ 0.01	[1]	$ 0.02	[1]	$ 0.02	[1]	$ 0.01	[1]	$ 0.03	[1]	$ 0.02	[1]	$ 0.02	[1]	$ 0.06	[1]	$ 0.08	[1]	$ 0.06
Income from discontinued operations, Diluted (dollars per share)	$ 0.01	[1]	$ 0.01	[1]	$ 0.02	[1]	$ 0.02	[1]	$ 0.01	[1]	$ 0.03	[1]	$ 0.02	[1]	$ 0.02	[1]	$ 0.06	[1]	$ 0.08	[1]	$ 0.06

[1] Per share amounts are calculated independently for each period presented; therefore, the sum of the quarterly per share amounts may not equal the per share amounts for the year.