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Organization - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 9 Months Ended | 12 Months Ended |  | 9 Months Ended | 12 Months Ended | 1 Months Ended |  |  |  |
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Aug. 30, 2012 | Aug. 01, 2012 | Sep. 30, 2013 Employee Country | Sep. 30, 2012 | Dec. 31, 2012 | May 31, 2011 | Sep. 30, 2013 Fortune Global 500 Minimum Customer | Dec. 31, 2012 Selling, General and Administrative Expenses | Dec. 31, 2012 Other income (expense) | Aug. 31, 2007 Existing Shareholders | Mar. 24, 2010 General Electric Company | Dec. 31, 2012 General Electric Company Maximum | Dec. 14, 2012 General Atlantic | Dec. 14, 2012 Oak Hill Capital Partners | Oct. 25, 2012 Bain Purchaser | Oct. 25, 2012 Bain Co-Investor | Oct. 25, 2012 GIC Purchaser
Organization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of years of service |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of professionals around the globe, minimum |  |  | 60,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of countries in which entity operates |  |  | 24 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of clients |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |
Number of shares sold |  |  |  |  |  |  |  |  |  | 17,647,059 |  |  |  |  |  |  |
Percent of ownership held |  |  |  |  |  |  |  |  |  |  | 9.10% | 5.00% | 2.40% | 2.40% |  |  |
Common stock shares to be purchased by affiliates of Bain Capital Partners |  | 67,750,678 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of common shares, per share amount |  | $ 14.76 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Value of common stock shares to be purchased by affiliates of Bain Capital Partners |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declaration of special cash dividend, declared date |  | Aug. 30, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declaration of special cash dividend, payment date |  | Sep. 24, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declaration of special cash dividend, record date |  | Sep. 10, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares sold by selling shareholder |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 57,537,264 | 50,812 | 10,162,602
Termination of credit facility | 380,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New credit facility agreement | 925,000 |  |  |  |  | 380,000 |  |  |  |  |  |  |  |  |  |  |
Dividend per share | $ 2.24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend paid | 501,620 |  |  | 501,620 |  |  |  |  |  |  |  |  |  |  |  |  |
Total expenses incurred for 2012 recapitalization |  |  |  |  | 23,464 |  |  | 6,237 | 17,227 |  |  |  |  |  |  |  |
Reimbursement of expenses relating to 2012 recapitalization |  |  |  |  |  |  |  |  | $ 17,000 |  |  |  |  |  |  |  |

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