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Financial Derivatives and Hedging Activities - Outstanding Derivatives Used to Hedge Foreign Exchange Risks (Detail)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 PHP	Dec. 31, 2015 CAD	Dec. 31, 2014 USD ($)	Dec. 31, 2014 EUR (€)	Dec. 31, 2014 PHP	Dec. 31, 2014 CAD
Cash Flow Hedges [Member] | Euro / British Pound [Member] | Designated as Hedging [Member] | Sell/Buy - Sell Notional [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount | €		€ 10,527,000				€ 4,592,000
Cash Flow Hedges [Member] | Euro / Philippine Peso [Member] | Designated as Hedging [Member] | Sell/Buy - Buy Notional [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount | PHP			PHP 758,634,000				PHP 523,313,000
Cash Flow Hedges [Member] | British Pound / Philippine Peso [Member] | Designated as Hedging [Member] | Sell/Buy - Buy Notional [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount | PHP			PHP 542,063,000				PHP 260,535,000
Cash Flow Hedges [Member] | Euro / U.S. Dollar [Member] | Designated as Hedging [Member] | Sell/Buy - Buy Notional [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount | $	$ 51,433,000				$ 32,527,000
Cash Flow Hedges [Member] | U.S. Dollar / Canadian Dollar [Member] | Designated as Hedging [Member] | Sell/Buy - Buy Notional [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount | CAD				CAD 34,649,000				CAD 10,036,000
Foreign Currency Hedges [Member] | Euro / British Pound [Member] | Not Designated as Hedging [Member] | Sell/Buy - Sell Notional [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount | €						2,000,000
Foreign Currency Hedges [Member] | Euro / U.S. Dollar [Member] | Not Designated as Hedging [Member] | Sell/Buy - Buy Notional [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount | $	12,500,000
Foreign Currency Hedges [Member] | U.S Dollar / Euro [Member] | Not Designated as Hedging [Member] | Sell/Buy - Sell Notional [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount | $					4,000,000
Foreign Currency Hedges [Member] | U.S. Dollar / British Pound [Member] | Not Designated as Hedging [Member] | Sell/Buy - Sell Notional [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount | $	$ 10,000,000				$ 9,000,000
Foreign Currency Hedges [Member] | British Pound / Euro [Member] | Not Designated as Hedging [Member] | Sell/Buy - Sell Notional [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount | €		3,500,000
Foreign Currency Hedges [Member] | British Pound / Euro [Member] | Not Designated as Hedging [Member] | Sell/Buy - Buy Notional [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount | €		€ 13,500,000				€ 3,000,000

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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

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+ References

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