XML 37 R27.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Investments (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract] |
Short-Term and Long-Term Investments Available-for-Sale and Cost Method Investments | The fair value of investments classified as short-term consists of the following:
|  | June 30, 2017 |  |  | December 31, 2016 |
Available-for-sale investments: |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 13,530 |  |  | $ | 23,818 |
Bankers’ acceptance drafts |  |  | 1,934 |  |  |  | 1,439 |
Asset-backed securities |  |  | 32,632 |  |  |  | 36,809 |
Commercial paper |  |  | 11,629 |  |  |  | 24,381 |
Corporate obligations |  |  | 46,990 |  |  |  | 46,707 |
Municipal bonds |  |  | 250 |  |  |  | 591 |
Promissory note |  |  | 675 |  |  |  | 675 |
U.S. treasury obligations |  |  | 16,928 |  |  |  | 25,414 |
U.S. agency obligations |  |  | 24,448 |  |  |  | 29,629 |
|  | $ | 149,016 |  |  | $ | 189,463 |
Investments classified as long-term consists of the following:
|  | June 30, 2017 |  |  | December 31, 2016 |
Available-for-sale investments: |  |  |  |  |  |  |  |
Group insurance contracts |  | $ | 6,029 |  |  | $ | 5,558 |
Cost method investments: |  |  |  |  |  |  |  |
Minority interest in a private company(1) |  |  | 4,300 |  |  |  | 4,300 |
|  | $ | 10,329 |  |  | $ | 9,858 |
(1) | In April 2016, the Company invested $9,300 for a minority interest in a private company. For the year ended December 31, 2016, the Company recognized $5,000 of impairment charges related to this cost method investment.
Gross Unrealized Gains and (Losses) Aggregated by Investment Category | The following tables show the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments:
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
As of June 30, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 13,530 |  |  | $ | — |  |  | $ | — |  |  | $ | 13,530 |
Bankers’ acceptance drafts |  |  | 1,934 |  |  |  | — |  |  |  | — |  |  |  | 1,934 |
Asset-backed securities |  |  | 32,655 |  |  |  | 13 |  |  |  | (36 | ) |  |  | 32,632 |
Commercial paper |  |  | 11,664 |  |  |  | — |  |  |  | (35 | ) |  |  | 11,629 |
Corporate obligations |  |  | 46,915 |  |  |  | 81 |  |  |  | (6 | ) |  |  | 46,990 |
Municipal bonds |  |  | 250 |  |  |  | — |  |  |  | — |  |  |  | 250 |
Promissory note |  |  | 675 |  |  |  | — |  |  |  | — |  |  |  | 675 |
U.S. treasury obligations |  |  | 16,905 |  |  |  | 23 |  |  |  | — |  |  |  | 16,928 |
U.S. agency obligations |  |  | 24,437 |  |  |  | 14 |  |  |  | (3 | ) |  |  | 24,448 |
|  | $ | 148,965 |  |  | $ | 131 |  |  | $ | (80 | ) |  | $ | 149,016 |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
As of June 30, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Group insurance contracts |  | $ | 6,888 |  |  | $ | — |  |  | $ | (859 | ) |  | $ | 6,029 |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
As of December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 23,818 |  |  | $ | — |  |  | $ | — |  |  | $ | 23,818 |
Bankers acceptance drafts |  |  | 1,439 |  |  |  | — |  |  |  | — |  |  |  | 1,439 |
Asset-backed securities |  |  | 36,847 |  |  |  | 6 |  |  |  | (44 | ) |  |  | 36,809 |
Commercial paper |  |  | 24,423 |  |  |  | — |  |  |  | (42 | ) |  |  | 24,381 |
Corporate obligations |  |  | 46,700 |  |  |  | 21 |  |  |  | (14 | ) |  |  | 46,707 |
Municipal bonds |  |  | 591 |  |  |  | — |  |  |  | — |  |  |  | 591 |
Promissory note |  |  | 675 |  |  |  | — |  |  |  | — |  |  |  | 675 |
U.S. treasury obligations |  |  | 25,414 |  |  |  | — |  |  |  | — |  |  |  | 25,414 |
U.S. agency obligations |  |  | 29,631 |  |  |  | 8 |  |  |  | (10 | ) |  |  | 29,629 |
|  | $ | 189,538 |  |  | $ | 35 |  |  | $ | (110 | ) |  | $ | 189,463 |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
As of December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Group insurance contracts |  | $ | 6,276 |  |  | $ | — |  |  | $ | (718 | ) |  | $ | 5,558 |

X
- Definition Investments classified as short-term and long-term available-for-sale investments and long-term cost method investments. + References No definition available. + Details
Name: | mksi_InvestmentsClassifiedAsShortTermAndLongTermAvailableForSaleInvestmentsAndLongTermCostMethodInvestmentsTableTextBlock
Namespace Prefix: | mksi_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration