Quarterly Results of Operations (unaudited) - Schedule of Quarterly Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2013 First Quarter [Member]	Mar. 31, 2012 First Quarter [Member]	Jun. 30, 2013 Second Quarter [Member]	Jun. 30, 2012 Second Quarter [Member]	Sep. 30, 2013 Third Quarter [Member]	Sep. 30, 2012 Third Quarter [Member]	Dec. 31, 2013 Fourth Quarter [Member]	Dec. 31, 2012 Fourth Quarter [Member]
Quarterly Results Of Operations [Line Items]
Net sales of tangible products	$ 984,532	$ 948,227	$ 936,282	$ 225,121	$ 232,476	$ 239,909	$ 234,708	$ 249,919	$ 239,786	$ 269,583	$ 241,257
Revenue from services and software	53,627	47,941	47,206	11,816	11,399	13,251	12,369	13,604	12,251	14,956	11,922
Total net sales	1,038,159	996,168	983,488	236,937	243,875	253,160	247,077	263,523	252,037	284,539	253,179
Cost of sales of tangible products	507,513	479,633	469,834	117,111	119,033	125,664	119,980	128,191	118,751	136,547	121,869
Cost of sales services and software	27,036	24,891	26,885	6,761	4,959	6,589	6,720	6,722	6,362	6,964	6,850
Cost of sales	534,549	504,524	496,719	123,872	123,992	132,253	126,700	134,913	125,113	143,511	128,719
Gross Profit	503,610	491,644	486,769	113,065	119,883	120,907	120,377	128,610	126,924	141,028	124,460
Selling and marketing	138,020	129,906	127,797	33,515	32,114	33,830	32,158	34,395	32,321	36,280	33,313
Research and development	91,147	87,364	89,926	21,858	20,416	23,201	22,336	22,376	22,007	23,712	22,605
General and administrative	96,216	92,167	81,345	25,277	24,320	24,053	24,402	22,452	22,481	24,434	20,964
Amortization of intangible assets	7,383	4,673	3,320	1,863	770	1,863	770	1,831	1,670	1,826	1,463
Acquisition costs	4,690	3,109	304	482	254	618	1,252	268	566	3,322	1,037
Exit and restructuring costs	5,890	960	2,041	1,895	0	1,101	0	519	0	2,375	960
Asset impairment charge	0	9,114	0		0		0		9,114		0
Total operating expenses	343,346	327,293	304,733	84,890	77,874	84,666	80,918	81,841	88,159	91,949	80,342
Operating income	160,264	164,351	182,036	28,175	42,009	36,241	39,459	46,769	38,765	49,079	44,118
Investment income	2,366	2,485	1,944	677	592	473	826	550	541	666	526
Foreign exchange loss	(524)	(941)	(2,006)	(98)	(342)	(462)	(80)	(173)	(514)	209	(5)
Other, net	1,721	(1,721)	(2,255)	10	(364)	1,464	(486)	(5)	(294)	252	(577)
Total other income (loss)	3,563	(177)	(2,317)	589	(114)	1,475	260	372	(267)	1,127	(56)
Income from continuing operations before income taxes	163,827	164,174	179,719	28,764	41,895	37,716	39,719	47,141	38,498	50,206	44,062
Income taxes	29,602	42,277	49,376	5,222	11,731	7,158	9,366	8,541	11,917	8,681	9,263
Income from continuing operations	134,225	121,897	130,343	23,542	30,164	30,558	30,353	38,600	26,581	41,525	34,799
Income from discontinued operations, net of tax	133	1,007	44,300	0	0	8	300	0	516	125	191
Net income	$ 134,358	$ 122,904	$ 174,643	$ 23,542	$ 30,164	$ 30,566	$ 30,653	$ 38,600	$ 27,097	$ 41,650	$ 34,990
Income from continuing operations	$ 2.65	$ 2.36	$ 2.42	$ 0.46	$ 0.58	$ 0.60	$ 0.58	$ 0.76	$ 0.52	$ 0.83	$ 0.69
Income from discontinued operations	$ 0.00	$ 0.02	$ 0.82	$ 0.00	$ 0.00	$ 0.00	$ 0.01	$ 0.00	$ 0.01	$ 0.00	$ 0.00
Net Income	$ 2.65	$ 2.38	$ 3.24	$ 0.46	$ 0.58	$ 0.60	$ 0.59	$ 0.76	$ 0.53	$ 0.83	$ 0.69
Income from continuing operations	$ 2.63	$ 2.35	$ 2.40	$ 0.46	$ 0.58	$ 0.60	$ 0.58	$ 0.76	$ 0.51	$ 0.82	$ 0.68
Income from discontinued operations	$ 0.00	$ 0.02	$ 0.82	$ 0.00	$ 0.00	$ 0.00	$ 0.01	$ 0.00	$ 0.01	$ 0.00	$ 0.00
Net Income	$ 2.63	$ 2.37	$ 3.22	$ 0.46	$ 0.58	$ 0.60	$ 0.59	$ 0.76	$ 0.52	$ 0.82	$ 0.68
Basic weighted average shares outstanding	50,693	51,566	53,854	50,980	51,998	50,990	51,771	50,590	51,566	50,289	50,968
Diluted weighted average and equivalent shares outstanding	51,063	51,843	54,191	51,366	52,301	51,283	52,030	50,924	51,809	50,666	51,262