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Acquisitions - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended |  | 1 Months Ended |  | 3 Months Ended | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2011 | Mar. 31, 2011 Customer Relationships | Dec. 31, 2012 Corporate Finance Segment | Oct. 31, 2012 Corporate Finance Segment | Mar. 31, 2012 Corporate Finance Segment | Sep. 30, 2010 2010 Acquisitions | Dec. 31, 2010 2010 Acquisitions | Jun. 30, 2010 2010 Acquisitions | Dec. 31, 2010 2010 Acquisitions Customer Relationships | Dec. 31, 2010 2010 Acquisitions Non-Competition Agreements
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation, goodwill | $ 18.6 | $ 27.3 | $ 14.8 |  |  |  | $ 31.6 |  | $ 47.2 | $ 2.6 |  |
Common stock consideration in relation to price protection provision guarantees | 4.2 |  |  |  |  |  |  |  |  |  |  |
Stock floor prices for common stock price guarantee provisions | $ 54.33 |  |  |  |  |  |  |  |  |  |  |
Stock floor prices for common stock price guarantee provisions | $ 69.48 |  |  |  |  |  |  |  |  |  |  |
Contingent consideration estimated fair value |  |  |  |  | 10.0 | 25.4 | 1.1 |  |  |  |  |
Contingent consideration payment, due date |  |  |  |  | Dec. 31, 2017 | Dec. 31, 2017 |  |  |  |  |  |
Contingent consideration cap amount |  |  |  |  | 15.0 | 16.0 |  |  | 37.1 |  |  |
Initial acquisition price |  |  |  |  |  |  | 3.1 | 86.4 |  | 2.8 |  |
Aggregate cash consideration |  |  | 27.1 |  |  |  | 2.0 | 20.2 |  | 2.3 |  |
Purchase price allocation, identifiable intangible assets |  |  | 6.3 |  |  |  | 6.5 |  | 6.9 | 0.2 | 5.8 | 1.3
Acquisition-date fair value of the total consideration transferred |  |  | 30.0 |  |  |  |  |  |  |  |  |
Contingent consideration estimated fair value |  |  | 2.9 |  |  |  |  | 18.2 |  | 0.5 |  |
Purchase price allocation, accounts receivable |  |  | 24.2 |  |  |  |  |  |  |  |  |
Purchase price allocation, assumed liabilities |  |  | 20.6 |  |  |  |  |  |  |  |  |
Acquisition-related costs |  | 1.5 |  |  |  |  |  |  |  |  |  |
Weighted average amortization period (in years) |  |  |  | 12 years 4 months 24 days |  |  |  |  |  |  | 5 years | 6 years
Cash held in escrow |  |  |  |  |  |  |  | 8.6 |  |  |  |
Loan notes to selling shareholders |  |  |  |  |  |  |  | 35.0 |  |  |  |
Reimbursement of seller expenses |  |  |  |  |  |  |  | $ 0.6 |  |  |  |
Beginning of term of contingent consideration payable annually |  |  |  |  |  |  |  |  | 2010 |  |  |
End of term of contingent consideration payable annually |  |  |  |  |  |  |  |  | 2015 |  |  |

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- Definition The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 52 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The amount of acquisition cost of a business combination allocated to receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 37 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 52 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 53 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The amount of acquisition cost of a business combination allocated to notes payables and long-term debt assumed from the acquired entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 98-1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 37 -Subparagraph g -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 59 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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