Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business And Significant Accounting Policies [Line Items]
Percentage of sales through direct channel	75.00%
Percentage of sales through indirect channel	25.00%
Period terms for payment	90 days
Expenses incurred related to shipping and handling of products	$ 181.9	$ 163.6	$ 139.5
Allowance for doubtful accounts	22.3	22.7
Goodwill impairment charge	$ 0	$ 0	$ 96.0
Instruments [Member]
Business And Significant Accounting Policies [Line Items]
Average estimated useful life	5 years
Minimum [Member]
Business And Significant Accounting Policies [Line Items]
Useful life of finite lived intangibles	1 year
Minimum [Member] | Building and Building Improvements [Member]
Business And Significant Accounting Policies [Line Items]
Average estimated useful life	10 years
Minimum [Member] | Machinery and Equipment [Member]
Business And Significant Accounting Policies [Line Items]
Average estimated useful life	3 years
Minimum [Member] | Capitalized Software Costs [Member]
Business And Significant Accounting Policies [Line Items]
Average estimated useful life	3 years
Maximum [Member]
Business And Significant Accounting Policies [Line Items]
Useful life of finite lived intangibles	40 years
Maximum [Member] | Building and Building Improvements [Member]
Business And Significant Accounting Policies [Line Items]
Average estimated useful life	40 years
Maximum [Member] | Machinery and Equipment [Member]
Business And Significant Accounting Policies [Line Items]
Average estimated useful life	8 years
Maximum [Member] | Capitalized Software Costs [Member]
Business And Significant Accounting Policies [Line Items]
Average estimated useful life	15 years