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Aggregate Notional Principal Amounts of Outstanding Derivative Financial Instruments with Related Balance Sheet Exposure (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Derivative [Line Items] |  |  |  |
Derivative financial instrument, balance sheet exposure asset (liability) | $ (270,691) | [1] | $ (163,431) | [1]
United States Dollars (sell) Indian Rupees (buy) |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instrument notional principal amount | 1,472,000 | [2] | 1,706,000 | [2]
Derivative financial instrument, balance sheet exposure asset (liability) | (269,392) | [1] | (160,432) | [1]
United States Dollars (sell) Mexican Peso (buy) |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instrument notional principal amount | 12,300 | [2] | 8,400 | [2]
Derivative financial instrument, balance sheet exposure asset (liability) | (422) | [1] | 306 | [1]
United States Dollars (sell) Philippines Peso (buy) |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instrument notional principal amount | 56,850 | [2] | 58,800 | [2]
Derivative financial instrument, balance sheet exposure asset (liability) | (1,723) | [1] | 2,237 | [1]
Euro (sell) United States Dollars (buy) |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instrument notional principal amount | 45,134 | [2] | 79,501 | [2]
Derivative financial instrument, balance sheet exposure asset (liability) | (1,836) | [1] | (420) | [1]
Euro (sell) Hungarian Forints (buy) |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instrument notional principal amount | 5,598 | [2] | 9,968 | [2]
Derivative financial instrument, balance sheet exposure asset (liability) | 51 | [1] | (10) | [1]
Euro (Sell) Romanian Leu (Buy) |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instrument notional principal amount | 63,689 | [2] | 64,870 | [2]
Derivative financial instrument, balance sheet exposure asset (liability) | 1,433 | [1] | (645) | [1]
Japanese Yen (sell) Chinese Renminbi (buy) |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instrument notional principal amount | 29,573 | [2] | 26,214 | [2]
Derivative financial instrument, balance sheet exposure asset (liability) | 2,046 | [1] | 1,451 | [1]
Pound Sterling (sell) United States Dollars (buy) |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instrument notional principal amount | 74,149 | [2] | 92,165 | [2]
Derivative financial instrument, balance sheet exposure asset (liability) | (2,791) | [1] | (2,494) | [1]
Australian Dollars (sell) United States Dollars (buy) |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instrument notional principal amount | 59,450 | [2] | 60,626 | [2]
Derivative financial instrument, balance sheet exposure asset (liability) | $ 1,943 | [1] | $ (3,424) | [1]
[1] | Balance sheet exposure is denominated in U.S. Dollars and denotes the mark-to-market impact of the derivative financial instruments on the reporting date.
[2] | Notional amounts are key elements of derivative financial instrument agreements but do not represent the amount exchanged by counterparties and do not measure the Company's exposure to credit or market risks. However, the amounts exchanged are based on the notional amounts and other provisions of the underlying derivative financial instruments agreements.

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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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- Definition Fair value of credit risk derivative asset after deduction of credit risk derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5708775-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 + Details
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