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Variable Interest Entity (VIE) - Changes in Noncontrolling Interest for Cercacor (Detail) (USD $)
In Thousands, unless otherwise specified

3 Months Ended

Apr. 04, 2015

Mar. 29, 2014

Variable Interest Entity [Abstract]

Noncontrolling Interest Table [Table Text Block]

	Three Months Ended   April 4, 2015
Noncontrolling interest, beginning of period	$	1,742
Increase in additional paid-in capital of noncontrolling interest	4
Net loss attributable to noncontrolling interest	701
Noncontrolling interest, end of period	$	1,045

Noncontrolling interest, beginning of period

$ 1,742us-gaap_MinorityInterest

Increase in additional paid-in capital of noncontrolling interest

4us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance

Net loss attributable to noncontrolling interest

701us-gaap_NetIncomeLossAttributableToNoncontrollingInterest

141us-gaap_NetIncomeLossAttributableToNoncontrollingInterest

Noncontrolling interest, end of period

$ 1,045us-gaap_MinorityInterest

X

- Definition

A tabular disclosure of the changes in the carrying amount of the entity's noncontrolling interests.

+ References

No definition available.

+ Details

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- Details

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Namespace Prefix:	masi_
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Balance Type:	na
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X

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.31)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 27

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 20

-Article 7

+ Details

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

X

- Definition

Amount of Net Income (Loss) attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4J

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

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- Definition

Amount of increase in noncontrolling interest from subsidiary issuance of equity interests to noncontrolling interest holders.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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