XML 44 R33.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Retirement Plans (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Costs of Retirement Plans | The following table summarizes the expense associated with the contributions made to these plans.
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
United States |  | $ | 410 |  |  | $ | 445 |  |  | $ | 861 |  |  | $ | 1,137 |
Canada |  | 54 |  |  | 67 |  |  | 113 |  |  | 118 |
United Kingdom |  | 98 |  |  | 160 |  |  | 213 |  |  | 218 |
|  | $ | 562 |  |  | $ | 672 |  |  | $ | 1,187 |  |  | $ | 1,473 |
United States Plan |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Net Benefit Costs | Net periodic pension costs for the United States defined benefit pension plans for the three- and six-month periods ended June 30, 2017 and 2016 are as follows:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Service cost |  | $ | — |  |  | $ | 9 |  |  | $ | — |  |  | $ | 18 |
Interest cost |  | 171 |  |  | 186 |  |  | 342 |  |  | 372 |
Expected return on plan assets |  | (178 | ) |  | (179 | ) |  | (355 | ) |  | (358 | )
Recognized net actuarial loss |  | 33 |  |  | 69 |  |  | 65 |  |  | 138 |
Net periodic pension cost |  | $ | 26 |  |  | $ | 85 |  |  | $ | 52 |  |  | $ | 170 |
United Kingdom Benefit Plans |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Net Benefit Costs | Net periodic pension costs for the United Kingdom defined benefit pension plan for the three- and six-month periods ended June 30, 2017 and 2016 are as follows:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Interest cost |  | $ | 55 |  |  | $ | 75 |  |  | $ | 110 |  |  | $ | 150 |
Expected return on plan assets |  | (66 | ) |  | (84 | ) |  | (132 | ) |  | (168 | )
Amortization of prior service costs and transition amount |  | 4 |  |  | 5 |  |  | 8 |  |  | 10 |
Recognized net actuarial loss |  | 71 |  |  | 39 |  |  | 142 |  |  | 78 |
Net periodic pension cost |  | $ | 64 |  |  | $ | 35 |  |  | $ | 128 |  |  | $ | 70 |

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfCostsOfRetirementPlansTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RetirementPlanNameAxis=us-gaap_DomesticPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanNameAxis=fstr_UnitedKingdomBenefitPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |