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Subsequent Events - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 6 Months Ended | 9 Months Ended | 0 Months Ended | 3 Months Ended
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Jul. 31, 2013 Entity | Jun. 30, 2012 Entity | Sep. 30, 2013 | Oct. 30, 2013 Subsequent Event [Member] | Dec. 31, 2013 Subsequent Event [Member] Entity
Subsequent Event [Line Items] |  |  |  |  |
Cash paid for acquisition |  | $ 57.5 |  |  | $ 180.8
Number of shares issued for acquisition of company | 763,272 | 1,927,113 |  |  | 2,747,412
Common stock value | 18.7 | 37.3 |  |  | 69.3
Number of business acquisitions | 2 | 4 |  |  | 3
Senior secured revolving credit facility |  |  | 700.0 | 1,325.0 |
Senior secured revolving credit |  |  |  | $ 1,625 |
Maturity date of senior secured revolving credit facility |  |  | Aug. 02, 2016 | Oct. 30, 2018 |

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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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