Fair Value of Outstanding Derivative Instruments (Detail) $ in Thousands	Mar. 31, 2018 USD ($)
Derivative [Line Items]
Derivative assets	$ 5
Derivatives designated as cash flow hedging instruments \| Foreign exchange option contracts
Derivative [Line Items]
Derivative assets	$ 5

Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

No definition available.

Name:	us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant