XML 64 R44.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Stock-Based Compensation (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2016
Schedule of Estimated Fair Value of TSR Performance-Based Restricted Stock Unit Awards Assumptions | The fair value was estimated using the Monte Carlo simulation model with the following assumptions:
|  | 2016 |  |  | 2015 |  |  | 2014 |
Risk-free interest rate |  |  | 0.97 | % |  |  | 0.77 | % |  |  | 0.75 | %
Teradyne volatility-historical |  |  | 27.0 | % |  |  | 28.2 | % |  |  | 36.1 | %
NYSE Composite Index volatility-historical |  |  | 13.1 | % |  |  | — | % |  |  | — | %
Philadelphia Semiconductor Index volatility-historical |  |  | — | % |  |  | 19.7 | % |  |  | 24.6 | %
Dividend yield |  |  | 1.24 | % |  |  | 1.33 | % |  |  | 1.25 | %
Fair Value of Stock Options Using Assumptions | The fair value of the stock options at grant date was estimated using the Black-Scholes option-pricing model with the following assumptions:
|  | 2016 |  |  | 2015 |  |  | 2014 |
Expected life (years) |  |  | 5.0 |  |  |  | 4.0 |  |  |  | 4.0 |
Risk-free interest rate |  |  | 1.4 | % |  |  | 1.1 | % |  |  | 1.2 | %
Volatility-historical |  |  | 32.9 | % |  |  | 33.4 | % |  |  | 38.8 | %
Dividend yield |  |  | 1.24 | % |  |  | 1.33 | % |  |  | 1.25 | %
Stock Compensation Plan Activity | Stock compensation plan activity for the years 2016, 2015 and 2014 follows:
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  | (in thousands) |
Restricted Stock Units: |  |  |  |  |  |  |  |  |  |  |  |
Non-vested at January 1 |  |  | 4,070 |  |  |  | 4,352 |  |  |  | 4,636 |
Awarded |  |  | 1,471 |  |  |  | 1,681 |  |  |  | 1,870 |
Vested |  |  | (1,530 | ) |  |  | (1,679 | ) |  |  | (1,965 | )
Forfeited |  |  | (233 | ) |  |  | (284 | ) |  |  | (189 | )
Non-vested at December 31 |  |  | 3,778 |  |  |  | 4,070 |  |  |  | 4,352 |
Stock Options: |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at January 1 |  |  | 1,121 |  |  |  | 1,507 |  |  |  | 2,706 |
Granted |  |  | 130 |  |  |  | 132 |  |  |  | 89 |
Exercised |  |  | (324 | ) |  |  | (518 | ) |  |  | (1,248 | )
Forfeited |  |  | — |  |  |  | — |  |  |  | (38 | )
Expired |  |  | (2 | ) |  |  | — |  |  |  | (2 | )
Outstanding at December 31 |  |  | 926 |  |  |  | 1,121 |  |  |  | 1,507 |
Vested and expected to vest at December 31 |  |  | 926 |  |  |  | 1,121 |  |  |  | 1,507 |
Exercisable at December 31 |  |  | 598 |  |  |  | 779 |  |  |  | 1,089 |
Share Based Compensation Total Shares Available | Total shares available for the years 2016, 2015 and 2014:
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  | (in thousands) |
Shares available: |  |  |  |  |  |  |  |  |  |  |  |
Available for grant at January 1 |  |  | 10,914 |  |  |  | 12,443 |  |  |  | 14,213 |
Options granted |  |  | (130 | ) |  |  | (132 | ) |  |  | (89 | )
Restricted stock units awarded |  |  | (1,471 | ) |  |  | (1,681 | ) |  |  | (1,870 | )
Restricted stock units forfeited |  |  | 233 |  |  |  | 284 |  |  |  | 189 |
Available for grant at December 31 |  |  | 9,546 |  |  |  | 10,914 |  |  |  | 12,443 |
Weighted-Average Restricted Stock Unit Award Date Fair Value | Weighted average restricted stock unit award date fair value information for the years 2016, 2015 and 2014 follows:
|  | 2016 |  |  | 2015 |  |  | 2014 |
Non-vested at January 1 |  | $ | 17.46 |  |  | $ | 17.24 |  |  | $ | 15.60 |
Awarded |  |  | 18.68 |  |  |  | 17.36 |  |  |  | 18.41 |
Vested |  |  | 17.21 |  |  |  | 16.85 |  |  |  | 14.38 |
Forfeited |  |  | 17.57 |  |  |  | 17.08 |  |  |  | 16.97 |
Non-vested at December 31 |  | $ | 18.03 |  |  | $ | 17.46 |  |  | $ | 17.24 |
Restricted Stock Unit Awards Aggregate Intrinsic Value | Restricted stock unit awards aggregate intrinsic value information at December 31 for the years 2016, 2015 and 2014 follows:
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  | (in thousands) |
Vested |  | $ | 30,008 |  |  | $ | 32,200 |  |  | $ | 37,160 |
Outstanding |  |  | 95,952 |  |  |  | 84,129 |  |  |  | 86,113 |
Expected to vest |  |  | 91,871 |  |  |  | 79,611 |  |  |  | 81,582 |
Restricted Stock Units Weighted Average Remaining Contractual Terms | Restricted stock units weighted average remaining contractual terms (in years) information at December 31, for the years 2016, 2015 and 2014 follows:
|  | 2016 |  |  | 2015 |  |  | 2014 |
Outstanding |  |  | 1.04 |  |  |  | 1.09 |  |  |  | 1.11 |
Expected to vest |  |  | 1.03 |  |  |  | 1.08 |  |  |  | 1.10 |
Weighted Average Stock Options Exercise Price | Weighted average stock options exercise price information for the year ended December 31, 2016 follows:
|  | 2016 |
Outstanding at January 1 |  | $ | 10.21 |
Options granted |  |  | 19.43 |
Options exercised |  |  | 9.06 |
Options expired |  |  | 3.07 |
Outstanding at December 31 |  |  | 11.93 |
Exercisable at December 31 |  |  | 8.32 |
Stock Option Aggregate Intrinsic Value Information | Stock option aggregate intrinsic value information for the years ended December 31, 2016, 2015 and 2014 follows:
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  | (in thousands) |
Exercised |  | $ | 3,729 |  |  | $ | 7,255 |  |  | $ | 17,847 |
Outstanding |  |  | 12,468 |  |  |  | 11,729 |  |  |  | 17,936 |
Vested and expected to vest |  |  | 12,468 |  |  |  | 11,729 |  |  |  | 17,936 |
Exercisable |  |  | 10,217 |  |  |  | 10,716 |  |  |  | 16,101 |
Stock Options Weighted Average Remaining Contractual Terms | Stock options weighted average remaining contractual terms (in years) information at December 31, for the years 2016, 2015 and 2014 follows:
|  | 2016 |  |  | 2015 |  |  | 2014 |
Outstanding |  |  | 3.9 |  |  |  | 4.2 |  |  |  | 4.5 |
Vested and expected to vest |  |  | 3.9 |  |  |  | 4.2 |  |  |  | 4.5 |
Exercisable |  |  | 3.2 |  |  |  | 3.9 |  |  |  | 4.2 |
Significant Option Groups Outstanding | Significant option groups outstanding at December 31, 2016 and related weighted average price and remaining contractual life information follow:
|  | Options Outstanding |  |  | Options Exercisable |
Range Of Exercise Prices |  | Weighted- Average Remaining Contractual Life (Years) |  |  | Shares |  |  | Weighted- Average Exercise Price |  |  | Shares |  |  | Weighted- Average Exercise Price |
|  | (shares in thousands) |
$1.48 – $2.67 |  |  | 3.74 |  |  |  | 294 |  |  | $ | 2.31 |  |  |  | 294 |  |  | $ | 2.31 |
$3.23 – $7.71 |  |  | 1.77 |  |  |  | 75 |  |  |  | 4.26 |  |  |  | 75 |  |  |  | 4.26 |
$16.23 – $18.10 |  |  | 3.51 |  |  |  | 338 |  |  |  | 17.18 |  |  |  | 185 |  |  |  | 16.87 |
$19.16 – $19.43 |  |  | 5.26 |  |  |  | 219 |  |  |  | 19.32 |  |  |  | 44 |  |  |  | 19.16 |
|  |  |  |  |  |  | 926 |  |  | $ | 11.93 |  |  |  | 598 |  |  | $ | 8.32 |
Effect to Income (Loss) from Operations for Recording Stock-Based Compensation | The effect to income from operations for recording stock-based compensation for the years ended December 31 was as follows:
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  | (in thousands) |
Cost of revenues |  | $ | 3,153 |  |  | $ | 3,065 |  |  | $ | 3,675 |
Engineering and development |  |  | 9,458 |  |  |  | 9,362 |  |  |  | 10,146 |
Selling and administrative |  |  | 18,139 |  |  |  | 18,024 |  |  |  | 26,486 |
Stock-based compensation |  |  | 30,750 |  |  |  | 30,451 |  |  |  | 40,307 |
Income tax benefit |  |  | (8,752 | ) |  |  | (8,528 | ) |  |  | (11,537 | )
Total stock-based compensation expense after income taxes |  | $ | 21,998 |  |  | $ | 21,923 |  |  | $ | 28,770 |

X
- Definition Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Aggregate Intrinsic Value Table Text Block + References No definition available. + Details
Name: | ter_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueTableTextBlock
Namespace Prefix: | ter_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Contractual Terms Table Text Block + References No definition available. + Details
Name: | ter_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageContractualTermsTableTextBlock
Namespace Prefix: | ter_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Total Shares Available Table Text Block + References No definition available. + Details
Name: | ter_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardTotalSharesAvailableTableTextBlock
Namespace Prefix: | ter_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule Of Share Based Payment Award Total Shareholder Return Plan Valuation Assumptions [Table Text Block] + References No definition available. + Details
Name: | ter_ScheduleOfShareBasedPaymentAwardTotalShareholderReturnPlanValuationAssumptionsTableTextBlock
Namespace Prefix: | ter_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule Of Weighted Average Stock Options Exercise Price Table Text Block + References No definition available. + Details
Name: | ter_ScheduleOfWeightedAverageStockOptionsExercisePriceTableTextBlock
Namespace Prefix: | ter_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in other outstanding share-based compensation awards other than stock options or nonvested awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfOtherShareBasedCompensationActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the number, aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both restricted stock units outstanding and restricted stock units fully vested and expected to vest at the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockUnitsVestedAndExpectedToVestTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
Name: | us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration