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Stock-Based Compensation Plans and Arrangements - Restricted Stock and Performance Stock Unit Activity (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Number of Shares, Non-vested, beginning balance 33,333us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockMember
Granted, Shares 49,123us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockMember
Vested, Shares (33,333)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockMember		 [1]
Canceled, Shares (684)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockMember
Spin-Off adjustment, shares 6,529slm_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsSpinoffAdjustment
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockMember		 [2]
Number of Shares, Non-vested, ending balance 54,968us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockMember		 [3]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted Average Grant Date Fair Value, Non-vested, beginning balance $ 12.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockMember
Granted, Weighted Average Grant Date Fair Value $ 9.46us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockMember
Vested, Weighted Average Grant Date Fair Value $ 12.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockMember		 [1]
Canceled, Weighted Average Grant Date Fair Value $ 21.91slm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCanceledForfeitedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockMember
Spin-Off adjustment, Weighted Average Grant Date Fair Value $ 7.89slm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSpinOffAdjustmentWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockMember		 [2]
Weighted Average Grant Date Fair Value, Non-vested, ending balance $ 9.12us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockMember		 [3]
Restricted Stock Units and Performance Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Number of Shares, Non-vested, beginning balance 1,421,007us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= slm_RestrictedStockUnitsAndPerformanceStockUnitsMember
Granted, Shares 1,904,169us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= slm_RestrictedStockUnitsAndPerformanceStockUnitsMember
Vested, Shares (750,707)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_PlanNameAxis
= slm_RestrictedStockUnitsAndPerformanceStockUnitsMember		 [4]
Canceled, Shares (367,684)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_PlanNameAxis
= slm_RestrictedStockUnitsAndPerformanceStockUnitsMember
Spin-Off adjustment, shares 4,072,958slm_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsSpinoffAdjustment
/ us-gaap_PlanNameAxis
= slm_RestrictedStockUnitsAndPerformanceStockUnitsMember		 [5]
Number of Shares, Non-vested, ending balance 6,279,743us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= slm_RestrictedStockUnitsAndPerformanceStockUnitsMember		 [6]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted Average Grant Date Fair Value, Non-vested, beginning balance $ 16.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= slm_RestrictedStockUnitsAndPerformanceStockUnitsMember
Granted, Weighted Average Grant Date Fair Value $ 18.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= slm_RestrictedStockUnitsAndPerformanceStockUnitsMember
Vested, Weighted Average Grant Date Fair Value $ 16.83us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= slm_RestrictedStockUnitsAndPerformanceStockUnitsMember		 [4]
Canceled, Weighted Average Grant Date Fair Value $ 17.70slm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCanceledForfeitedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= slm_RestrictedStockUnitsAndPerformanceStockUnitsMember
Spin-Off adjustment, Weighted Average Grant Date Fair Value $ 7.16slm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSpinOffAdjustmentWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= slm_RestrictedStockUnitsAndPerformanceStockUnitsMember		 [5]
Weighted Average Grant Date Fair Value, Non-vested, ending balance $ 10.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= slm_RestrictedStockUnitsAndPerformanceStockUnitsMember		 [6]
[1] The total fair value of shares that vested during the years ended December 31, 2014, 2013 and 2012 was $427, $592 and $1,189, respectively.
[2] Represents the adjustment to preserve the intrinsic value of the outstanding equity awards held by SLM and Navient employees.
[3] As of December 31, 2014, there was $188 of unrecognized compensation cost related to restricted stock net of estimated forfeitures, which is expected to be recognized over a weighted average period of 0.5 years.
[4] The total fair value of RSUs/PSUs that vested and converted to common stock during the years ended December 31, 2014, 2013 and 2012 was $12,636, $6,415 and $2,656, respectively.
[5] This represents the adjustment to preserve the intrinsic value of the outstanding equity awards held by SLM and Navient employees.
[6] As of December 31, 2014, there was $14,506 of unrecognized compensation cost related to RSUs net of estimated forfeitures, which is expected to be recognized over a weighted average period of 2.3 years.