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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) | Jan. 31, 2016 USD ($) Country Office | Jan. 31, 2015 USD ($) | Jan. 31, 2016 USD ($) Country Office | Jan. 31, 2015 USD ($) | Apr. 30, 2015 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of offices | Office |  | 150 |  | 150 |  |
Number of countries in which entity operates | Country |  | 52 |  | 52 |  |
Investments in affiliated companies maximum |  | 50.00% |  | 50.00% |  |
Deferred revenue |  | $ 94,000,000 |  | $ 94,000,000 |  | $ 40,500,000
Cash equivalents |  | 69,900,000 |  | 69,900,000 |  | 260,600,000
Realized loss of other-than-temporary impairment |  | 0 | $ 0 | 0 | $ 0 |
Impairment of goodwill |  |  |  | 0 |  | 0
Impairment of intangible assets |  |  |  | 0 |  | 0
Performance related bonus expenses |  | 41,100,000 | 37,800,000 | 128,100,000 | 122,100,000 |
(Decrease) increase in performance related bonus expenses |  |  |  | (600,000) | (300,000) |
Performance related bonus after reduction in the previous year estimate |  |  |  | 127,500,000 | 121,800,000 |
Income tax (benefit) provision | $ (2,100,000) | (5,355,000) | $ 9,576,000 | 13,211,000 | $ 26,392,000 |
Reclassification of deferred tax assets from current to non current |  |  |  |  |  | $ 3,800,000
Not Designated as Hedging Instrument | Foreign Exchange Forward |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Foreign currency gain/(loss) |  | (400,000) |  |  |  |
Not Designated as Hedging Instrument | Foreign Exchange Forward | Prepaid Expenses and Other Current Assets | Derivatives Purchased |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Derivative notional amount |  | 8,900,000 |  | 8,900,000 |  |
Not Designated as Hedging Instrument | Foreign Exchange Forward | Prepaid Expenses and Other Current Assets | Derivatives Sold |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Derivative notional amount |  | $ 51,300,000 |  | $ 51,300,000 |  |
Minimum |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Intangible assets estimated useful lives |  |  |  | 1 year |  |
Maximum |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Intangible assets estimated useful lives |  |  |  | 24 years |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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