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Inventories - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Jan. 02, 2016
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Inventory Disclosure [Abstract] |  |
Finished goods inventory held by distributors | $ 4.9 | $ 2.9

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- Definition Inventory finished goods held by distributors. + References No definition available. + Details
Name: | masi_InventoryFinishedGoodsHeldByDistributors
Namespace Prefix: | masi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_InventoryDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration