Derivatives and Hedging - Additional Information (Detail) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of derivative assets and liabilities	$ 239,400,000	$ 161,800,000
Designated as Cash Flow Hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of derivative assets and liabilities	3,900,000	3,200,000
Brazilian Real, British Pound Sterling, Israeli Shekel, Australian dollar, Japanese Yen, Chinese renminbi and Euro Denominated Intercompany Balances [Member] | Not Designated for Hedge Accounting Treatment [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of derivative assets and liabilities	144,500,000	90,700,000
Brazilian Real, British Pound Sterling, Australian Dollar, Israeli Shekel, And Euro-Denominated Trade Receivables [Member] | Not Designated for Hedge Accounting Treatment [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of derivative assets and liabilities	44,400,000	39,800,000
British Pounds Sterling, Indian Rupee, and Euro-Denominated other net monetary assets. | Not Designated for Hedge Accounting Treatment [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of derivative assets and liabilities	46,600,000	28,200,000
Foreign Exchange Contracts [Member] | Designated as Cash Flow Hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of derivative assets and liabilities	3,900,000	3,200,000
Forward Contracts [Member] | Not Designated for Hedge Accounting Treatment [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of derivative assets and liabilities	$ 235,500,000	$ 158,700,000