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Short-Term Bank Loans (Detail) $ in Thousands	Dec. 31, 2016 USD ($)
Short-term Debt [Line Items]
Bank loan	$ 25,000
Secured Loans
Short-term Debt [Line Items]
Bank loan	$ 25,000

X

- Definition

Amounts due on short-term bank loans secured by customers' securities on the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_BankLoans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShortTermDebtLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_DebtInstrumentAxis=simo_SecuredLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: