Fair Value Measurements - Schedule of Fair Values of Financial Assets and Liabilities (Detail) $ in Thousands	Jun. 30, 2017 USD ($)
Financial assets:
Cash equivalents	$ 57,149
Investments	25,121
Total financial assets	82,270
Financial liabilities:
Derivative financial instruments, net of tax	77
Level 1 [Member]
Financial assets:
Cash equivalents	57,149
Total financial assets	57,149
Level 2 [Member]
Financial assets:
Investments	25,121
Total financial assets	25,121
Financial liabilities:
Derivative financial instruments, net of tax	$ 77