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Other Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |  | 6 Months Ended |  | 6 Months Ended
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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