Other Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended				6 Months Ended									6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2013 Internally Developed Software and Other Costs [Member]	Jun. 30, 2012 Internally Developed Software and Other Costs [Member]	Jun. 30, 2013 Others [Member]	Jun. 30, 2013 Cost of Goods Sold [Member] Others [Member]	Jun. 30, 2012 Cost of Goods Sold [Member] Others [Member]	Jun. 30, 2013 Selling, General and Administrative Expenses [Member] Others [Member]	Jun. 30, 2012 Selling, General and Administrative Expenses [Member] Others [Member]	Jun. 30, 2013 Strata [Member]	Dec. 24, 2012 Strata [Member]	Jun. 30, 2013 Strata [Member] Technology [Member]	Jun. 30, 2013 Strata [Member] Customer Relationships [Member]	Jun. 30, 2013 Strata [Member] Non-Compete Agreements [Member]	Jun. 30, 2013 Strata [Member] Cost of Goods Sold [Member] Technology [Member]	Jun. 30, 2012 Strata [Member] Cost of Goods Sold [Member] Technology [Member]	Jun. 30, 2013 Strata [Member] Selling, General and Administrative Expenses [Member] Customer Relationships [Member]	Jun. 30, 2012 Strata [Member] Selling, General and Administrative Expenses [Member] Customer Relationships [Member]	Jun. 30, 2013 Strata [Member] Selling, General and Administrative Expenses [Member] Non-Compete Agreements [Member]	Jun. 30, 2012 Strata [Member] Selling, General and Administrative Expenses [Member] Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Percentage of voting equity interest acquired															100.00%
Allocation of purchase price to other intangible assets														$ 48.0		$ 18.3	$ 28.2	$ 1.5
Weighted average expected life														13 years 1 month 6 days		16 years 6 months	11 years 6 months	2 years
Amortization expense	2.1	1.0	4.2	2.0			0	0		1.2	1.2	0.8	0.8						0.6	0	1.2	0	0.4	0
Intangible asset	$ 110.0	$ 54.7	$ 110.0	$ 54.7	$ 106.2	$ 51.2	$ 13.9	$ 6.6	$ 48.1
Assets being amortized duration									13 years