Financial Derivatives and Hedging Activities - Outstanding Derivatives Used to Hedge Foreign Exchange Risks (Detail)	Sep. 30, 2022 EUR (€)	Sep. 30, 2022 USD ($)	Sep. 30, 2022 PHP (₱)	Sep. 30, 2022 CAD ($)	Sep. 30, 2022 GBP (£)	Dec. 31, 2021 EUR (€)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 PHP (₱)	Dec. 31, 2021 CAD ($)	Dec. 31, 2021 GBP (£)
Cash Flow Hedges | Euro / British Pound | Designated as Hedging | Sell Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | €	€ 22,203,000					€ 18,823,000
Cash Flow Hedges | U.S. Dollar / British Pound | Designated as Hedging | Sell Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount		$ 28,754,000					$ 16,205,000
Cash Flow Hedges | U.S. Dollar / Euro | Designated as Hedging | Sell Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount		1,911,000					658,000
Cash Flow Hedges | Euro / Philippine Peso | Designated as Hedging | Buy Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | ₱			₱ 964,410,000					₱ 896,291,000
Cash Flow Hedges | British Pound / Philippine Peso | Designated as Hedging | Buy Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | ₱			₱ 1,301,671,000					₱ 1,121,183,000
Cash Flow Hedges | Euro / U.S. Dollar | Designated as Hedging | Buy Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount		96,822,000					108,467,000
Cash Flow Hedges | U.S. Dollar / Canadian Dollar | Designated as Hedging | Buy Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount				$ 36,649,000					$ 36,904,000
Foreign Currency Hedges | U.S. Dollar / British Pound | Not Designated as Hedging | Sell Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount		29,200,000					26,600,000
Foreign Currency Hedges | Euro / U.S. Dollar | Not Designated as Hedging | Sell Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | €	7,200,000					11,000,000
Foreign Currency Hedges | Euro / U.S. Dollar | Not Designated as Hedging | Buy Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount		6,300,000					20,900,000
Foreign Currency Hedges | British Pound / Euro | Not Designated as Hedging | Sell Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | £					£ 3,200,000					£ 3,400,000
Foreign Currency Hedges | British Pound / Euro | Not Designated as Hedging | Buy Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | €	17,800,000					5,300,000
Foreign Currency Hedges | U.S. Dollar / Swiss Franc | Not Designated as Hedging | Sell Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount		$ 430,000					$ 2,180,000
Foreign Currency Hedges | British Pound / Swiss Franc | Not Designated as Hedging | Sell Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | £					£ 2,420,000					£ 1,025,000
Foreign Currency Hedges | Euro / Swiss Franc | Not Designated as Hedging | Sell Notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | €	€ 7,830,000					€ 2,750,000