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Basis of Presentation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 6 Months Ended
--- | --- | ---
May 31, 2012 | Jun. 30, 2012
Basis of Presentation [Line Items] |  |
Purchase price | $ 243.9 | $ 243.9

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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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