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Fair Value Measurements - Schedule of Fair Values of Financial Assets and Liabilities (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Financial assets:
Cash equivalents	$ 55,634
Investments	30,038
Derivative financial instruments, net of tax	618
Total financial assets	86,290
Level 1 [Member]
Financial assets:
Cash equivalents	55,634
Total financial assets	55,634
Level 2 [Member]
Financial assets:
Investments	30,038
Derivative financial instruments, net of tax	618
Total financial assets	$ 30,656

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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