The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Name:	us-gaap_AmortizationOfIntangibleAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2014	Mar. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013
Quarterly Results Of Operations [Line Items]
Net sales of tangible products	$ 1,498,562us-gaap_SalesRevenueGoodsNet	$ 984,532us-gaap_SalesRevenueGoodsNet	$ 948,227us-gaap_SalesRevenueGoodsNet
Revenue from services and software	172,010us-gaap_SalesRevenueServicesNet	53,627us-gaap_SalesRevenueServicesNet	47,941us-gaap_SalesRevenueServicesNet
Total net sales	1,670,572us-gaap_SalesRevenueNet	1,038,159us-gaap_SalesRevenueNet	996,168us-gaap_SalesRevenueNet
Cost of sales of tangible products	792,137us-gaap_CostOfGoodsSold	507,513us-gaap_CostOfGoodsSold	479,633us-gaap_CostOfGoodsSold
Cost of sales services and software	100,410us-gaap_CostOfServices	27,036us-gaap_CostOfServices	24,891us-gaap_CostOfServices
Cost of sales	892,547us-gaap_CostOfGoodsAndServicesSold	534,549us-gaap_CostOfGoodsAndServicesSold	504,524us-gaap_CostOfGoodsAndServicesSold
Gross Profit	778,025us-gaap_GrossProfit	503,610us-gaap_GrossProfit	491,644us-gaap_GrossProfit
Selling and marketing	213,304us-gaap_SellingAndMarketingExpense	138,020us-gaap_SellingAndMarketingExpense	129,906us-gaap_SellingAndMarketingExpense
Research and development	151,103us-gaap_ResearchAndDevelopmentExpense	91,147us-gaap_ResearchAndDevelopmentExpense	87,364us-gaap_ResearchAndDevelopmentExpense
General and administrative	138,214us-gaap_GeneralAndAdministrativeExpense	96,216us-gaap_GeneralAndAdministrativeExpense	92,167us-gaap_GeneralAndAdministrativeExpense
Amortization of intangible assets	54,096us-gaap_AmortizationOfIntangibleAssets	7,383us-gaap_AmortizationOfIntangibleAssets	4,673us-gaap_AmortizationOfIntangibleAssets
Acquisition costs	126,711	4,690	3,109
Exit and restructuring costs	6,007us-gaap_RestructuringCharges	5,890us-gaap_RestructuringCharges	960us-gaap_RestructuringCharges
Total operating expenses	689,435us-gaap_OperatingExpenses	343,346us-gaap_OperatingExpenses	327,293us-gaap_OperatingExpenses
Operating income	88,590us-gaap_OperatingIncomeLoss	160,264us-gaap_OperatingIncomeLoss	164,351us-gaap_OperatingIncomeLoss
Foreign exchange income (loss)	(8,759)	(524)	(941)
Gain (loss) on forward interest rate swap	(4,649)	0	0
Other, net	(1,003)us-gaap_OtherNonoperatingIncomeExpense	1,819us-gaap_OtherNonoperatingIncomeExpense	(1,514)us-gaap_OtherNonoperatingIncomeExpense
Total other (expense) income	(71,961)us-gaap_NonoperatingIncomeExpense	3,563us-gaap_NonoperatingIncomeExpense	(177)us-gaap_NonoperatingIncomeExpense
Income (loss) from continuing operations before income taxes	16,629	163,827	164,174
Income tax (benefit)	(15,800)us-gaap_IncomeTaxExpenseBenefit	29,602us-gaap_IncomeTaxExpenseBenefit	42,277us-gaap_IncomeTaxExpenseBenefit
Income (loss) from continuing operations	32,429	134,225	121,897
Income from discontinued operations, net of tax	0	133	1,007
Net income (loss)	32,429us-gaap_NetIncomeLoss	134,358us-gaap_NetIncomeLoss	122,904us-gaap_NetIncomeLoss
Income from continuing operations	$ 0.64	$ 2.65	$ 2.36
Income from discontinued operations	$ 0.00	$ 0.00	$ 0.02
Net income (loss)	$ 0.64us-gaap_EarningsPerShareBasic	$ 2.65us-gaap_EarningsPerShareBasic	$ 2.38us-gaap_EarningsPerShareBasic
Income from continuing operations	$ 0.63	$ 2.63	$ 2.35
Income from discontinued operations	$ 0.00	$ 0.00	$ 0.02
Net income	$ 0.63us-gaap_EarningsPerShareDiluted	$ 2.63us-gaap_EarningsPerShareDiluted	$ 2.37us-gaap_EarningsPerShareDiluted
Basic weighted average shares outstanding	50,789	50,693	51,566
Diluted weighted average and equivalent shares outstanding	51,380	51,063	51,843
First Quarter [Member]
Quarterly Results Of Operations [Line Items]
Net sales of tangible products				261,892	225,121
Revenue from services and software				26,376	11,816
Total net sales				288,268	236,937
Cost of sales of tangible products				130,449	117,111
Cost of sales services and software				9,881	6,761
Cost of sales				140,330	123,872
Gross Profit				147,938	113,065
Selling and marketing				35,416	33,515
Research and development				22,857	21,858
General and administrative				28,391	25,277
Amortization of intangible assets				2,672	1,863
Acquisition costs				4,927	482
Exit and restructuring costs				267	1,895
Total operating expenses				94,530	84,890
Operating income				53,408	28,175
Investment income				421	677
Foreign exchange income (loss)				(292)	(98)
Gain (loss) on forward interest rate swap				0
Interest expense				(18)	(47)
Other, net				26	57
Total other (expense) income				137	589
Income (loss) from continuing operations before income taxes				53,545	28,764
Income tax (benefit)				11,939	5,222
Income (loss) from continuing operations				41,606	23,542
Income from discontinued operations, net of tax					0
Net income (loss)					23,542
Income from continuing operations					$ 0.46
Income from discontinued operations					$ 0.00
Net income (loss)				$ 0.83	$ 0.46
Income from continuing operations					$ 0.46
Income from discontinued operations					$ 0.00
Net income				$ 0.82	$ 0.46
Basic weighted average shares outstanding				50,402	50,980
Diluted weighted average and equivalent shares outstanding				50,974	51,366
Second Quarter [Member]
Quarterly Results Of Operations [Line Items]
Net sales of tangible products						270,049	239,909
Revenue from services and software						18,372	13,251
Total net sales						288,421	253,160
Cost of sales of tangible products						136,962	125,664
Cost of sales services and software						9,290	6,589
Cost of sales						146,252	132,253
Gross Profit						142,169	120,907
Selling and marketing						35,755	33,830
Research and development						23,710	23,201
General and administrative						26,321	24,053
Amortization of intangible assets						2,667	1,863
Acquisition costs						20,364	618
Exit and restructuring costs						287	1,101
Total operating expenses						109,104	84,666
Operating income						33,065	36,241
Investment income						379	473
Foreign exchange income (loss)						43	(462)
Gain (loss) on forward interest rate swap						(2,433)
Interest expense						(87)	(9)
Other, net						30	1,473
Total other (expense) income						(2,068)	1,475
Income (loss) from continuing operations before income taxes						30,997	37,716
Income tax (benefit)						3,440	7,158
Income (loss) from continuing operations						27,557	30,558
Income from discontinued operations, net of tax							8
Net income (loss)							30,566
Income from continuing operations							$ 0.60
Income from discontinued operations							$ 0.00
Net income (loss)						$ 0.54	$ 0.60
Income from continuing operations							$ 0.60
Income from discontinued operations							$ 0.00
Net income						$ 0.54	$ 0.60
Basic weighted average shares outstanding						50,606	50,990
Diluted weighted average and equivalent shares outstanding						51,278	51,283
Third Quarter [Member]
Quarterly Results Of Operations [Line Items]
Net sales of tangible products								282,643	249,919
Revenue from services and software								20,629	13,604
Total net sales								303,272	263,523
Cost of sales of tangible products								141,842	128,191
Cost of sales services and software								9,924	6,722
Cost of sales								151,766	134,913
Gross Profit								151,506	128,610
Selling and marketing								36,781	34,395
Research and development								25,225	22,376
General and administrative								24,741	22,452
Amortization of intangible assets								2,597	1,831
Acquisition costs								35,326	268
Exit and restructuring costs								(120)	519
Total operating expenses								124,550	81,841
Operating income								26,956	46,769
Investment income								(2,448)	550
Foreign exchange income (loss)								(83)	(173)
Gain (loss) on forward interest rate swap								185
Interest expense								(14)	(11)
Other, net								210	6
Total other (expense) income								(2,150)	372
Income (loss) from continuing operations before income taxes								24,806	47,141
Income tax (benefit)								9,861	8,541
Income (loss) from continuing operations								14,945	38,600
Income from discontinued operations, net of tax									0
Net income (loss)									38,600
Income from continuing operations									$ 0.76
Income from discontinued operations									$ 0.00
Net income (loss)								$ 0.29	$ 0.76
Income from continuing operations									$ 0.76
Income from discontinued operations									$ 0.00
Net income								$ 0.29	$ 0.76
Basic weighted average shares outstanding								50,835	50,590
Diluted weighted average and equivalent shares outstanding								51,461	50,924
Fourth Quarter [Member]
Quarterly Results Of Operations [Line Items]
Net sales of tangible products										683,978	269,583
Revenue from services and software										106,633	14,956
Total net sales										790,611	284,539
Cost of sales of tangible products										382,884	136,547
Cost of sales services and software										71,315	6,964
Cost of sales										454,199	143,511
Gross Profit										336,412	141,028
Selling and marketing										105,352	36,280
Research and development										79,311	23,712
General and administrative										58,761	24,434
Amortization of intangible assets										46,160	1,826
Acquisition costs										66,094	3,322
Exit and restructuring costs										5,573	2,375
Total operating expenses										361,251	91,949
Operating income										(24,839)	49,079
Investment income										934	666
Foreign exchange income (loss)										(8,427)	209
Gain (loss) on forward interest rate swap										(2,401)
Interest expense										(56,715)	(30)
Other, net										(1,271)	282
Total other (expense) income										(67,880)	1,127
Income (loss) from continuing operations before income taxes										(92,719)	50,206
Income tax (benefit)										(41,040)	8,681
Income (loss) from continuing operations										(51,679)	41,525
Income from discontinued operations, net of tax											125
Net income (loss)											$ 41,650
Income from continuing operations											$ 0.83
Income from discontinued operations											$ 0.00
Net income (loss)										$ (1.02)	$ 0.83
Income from continuing operations											$ 0.82
Income from discontinued operations											$ 0.00
Net income										$ (1.02)	$ 0.82
Basic weighted average shares outstanding										50,452	50,289
Diluted weighted average and equivalent shares outstanding										50,452	50,666