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Share-Based Payments - Stock Option Activity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | $ 1,786 us-gaap_AllocatedShareBasedCompensationExpense | $ 1,652 us-gaap_AllocatedShareBasedCompensationExpense
Employee Stock Option [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | 336 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember | 314 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember
Tax benefit related to share-based expense | 129 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember | 120 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember
Unrecognized share-based compensation, net of estimated forfeitures | 2,609 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember | 2,561 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember
Employee activity - stock options [Abstract] |  |
Stock option grants expire (in years) | 7 years |
Grants, vesting period (in years) | 3 years |
Expected dividend yield (in hundredths) | 1.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember | 1.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember
Expected stock price volatility | 33.90%fwrd_ExpectedStockPriceVolatility / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember | 40.60%fwrd_ExpectedStockPriceVolatility / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember
Weighted Average Risk Free Interest Rate | 1.60%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember | 1.60%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember
Expected life of options (in years) | 6 years 1 month 11 days | 5 years 5 months 11 days
Weighted-average fair value of options (dollars per share) | $ 16 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember | $ 15 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember
Outstanding, beginning of period (in shares) | 1,363 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember |
Granted (in shares) | 82 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember |
Exercised (in shares) | (481)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember |
Forfeited (in shares) | (14)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember |
Outstanding, end of period (in shares) | 950 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember |
Exercisable, end of period (in shares) | 757 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember |
Outstanding, beginning of period (in dollars per share) | $ 28 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember |
Grants in Period (in dollars per share) | $ 51 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember |
Exercises in Period (in dollars per share) | $ 27 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember |
Forfeited in period (in dollars per share) | $ 29 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember |
Outstanding, end of period (in dollars per share) | $ 30 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember |
Exercisable, end of period (in dollars per share) | $ 27 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember |
Aggregate Intrinsic Value Outstanding, end of period | 19,625 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember |
Aggregate Intrinsic Value Exercisable, end of period | $ 18,515 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember |
Weighted-average remaining contractual term Outstanding, end of period (in years) | 3 years 1 month 11 days |
Weighted-average remaining contractual term Exercisable, end of period (in years) | 2 years 3 months 11 days |

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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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