XML 82 R26.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Investments (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract] |
Fair Value of Short-Term Available-for-Sale Investments | The fair value of short-term investments with maturities or estimated lives of less than one year consists of the following:
|  | March 31, 2015 |  |  | December 31, 2014 |
Available-for-sale investments: |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 5,400 |  |  | $ | 20,900 |
Bankers’ acceptance drafts |  |  | 327 |  |  |  | 82 |
Commercial paper |  |  | 1,447 |  |  |  | — |
Corporate obligations |  |  | 58,331 |  |  |  | 24,020 |
Municipal bonds |  |  | 5,798 |  |  |  | 2,099 |
U.S. agency obligations |  |  | 87,328 |  |  |  | 82,493 |
|  | $ | 158,631 |  |  | $ | 129,594 |
Fair Value of Long-Term Available-for-Sale Investments | The fair value of long-term investments with maturities of more than one year consists of the following:
|  | March 31, 2015 |  |  | December 31, 2014 |
Available-for-sale investments: |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | — |  |  | $ | 48 |
Asset-backed securities |  |  | 129,242 |  |  |  | 75,674 |
Corporate obligations |  |  | 90,114 |  |  |  | 64,669 |
Municipal bonds |  |  | 1,880 |  |  |  | 1,254 |
U.S. agency obligations |  |  | 16,077 |  |  |  | 15,556 |
|  | $ | 237,313 |  |  | $ | 157,201 |
Gross Unrealized Gains and (Losses) Aggregated by Investment Category Short-Term and Long-Term Securities | The following tables show the gross unrealized gains and (losses) aggregated by investment category for short-term and long-term available-for-sale investments:
As of March 31, 2015: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 5,400 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,400 |
Bankers’ acceptance drafts |  |  | 327 |  |  |  | — |  |  |  | — |  |  |  | 327 |
Commercial paper |  |  | 1,447 |  |  |  | — |  |  |  | — |  |  |  | 1,447 |
Corporate obligations |  |  | 58,336 |  |  |  | 10 |  |  |  | (15 | ) |  |  | 58,331 |
Municipal bonds |  |  | 5,800 |  |  |  | 1 |  |  |  | (3 | ) |  |  | 5,798 |
U.S. agency obligations |  |  | 87,311 |  |  |  | 23 |  |  |  | (6 | ) |  |  | 87,328 |
|  | $ | 158,621 |  |  | $ | 34 |  |  | $ | (24 | ) |  | $ | 158,631 |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset-backed securities |  |  | 129,209 |  |  | $ | 66 |  |  | $ | (33 | ) |  | $ | 129,242 |
Corporate obligations |  |  | 90,128 |  |  |  | 44 |  |  |  | (58 | ) |  |  | 90,114 |
Municipal bonds |  |  | 1,878 |  |  |  | 3 |  |  |  | (1 | ) |  |  | 1,880 |
U.S. agency obligations |  |  | 16,070 |  |  |  | 8 |  |  |  | (1 | ) |  |  | 16,077 |
|  | $ | 237,285 |  |  | $ | 121 |  |  | $ | (93 | ) |  | $ | 237,313 |
As of December 31, 2014: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 20,901 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 20,900 |
Bankers’ acceptance drafts |  |  | 82 |  |  |  | — |  |  |  | — |  |  |  | 82 |
Corporate obligations |  |  | 24,029 |  |  |  | 2 |  |  |  | (11 | ) |  |  | 24,020 |
Municipal bonds |  |  | 2,100 |  |  |  | — |  |  |  | (1 | ) |  |  | 2,099 |
U.S. agency obligations |  |  | 82,488 |  |  |  | 14 |  |  |  | (9 | ) |  |  | 82,493 |
|  | $ | 129,600 |  |  | $ | 16 |  |  | $ | (22 | ) |  | $ | 129,594 |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 48 |  |  | $ | — |  |  | $ | — |  |  | $ | 48 |
Asset-backed securities |  |  | 75,778 |  |  |  | 5 |  |  |  | (109 | ) |  |  | 75,674 |
Corporate obligations |  |  | 64,842 |  |  |  | 1 |  |  |  | (174 | ) |  |  | 64,669 |
Municipal bonds |  |  | 1,258 |  |  |  | — |  |  |  | (4 | ) |  |  | 1,254 |
U.S. agency obligations |  |  | 15,563 |  |  |  | 2 |  |  |  | (9 | ) |  |  | 15,556 |
|  | $ | 157,489 |  |  | $ | 8 |  |  | $ | (296 | ) |  | $ | 157,201 |

X
- Definition Schedule of long-term available-for-sale investments fair value. + References No definition available. + Details
Name: | mksi_ScheduleOfLongTermAvailableForSaleInvestmentsFairValueTableTextBlock
Namespace Prefix: | mksi_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule of short-term available-for-sale investments fair value. + References No definition available. + Details
Name: | mksi_ScheduleOfShortTermAvailableForSaleInvestmentsFairValueTableTextBlock
Namespace Prefix: | mksi_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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