Fair Value Measurements - Additional Information (Detail) - 12 months ended Dec. 31, 2016 $ in Millions	USD ($)	EUR (€) Contract	CAD Contract	NZD Contract
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Number of foreign currency forward contracts outstanding | Contract		6	6	6
Matured Foreign Currency Forward Sale Contracts
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Notional Amount		€ 30,000,000	CAD 25,000,000
Total proceeds | $	$ 11
New Foreign Currency Forward Sale Contracts
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Notional Amount		€ 30,000,000	CAD 25,000,000	NZD 45,000,000