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Allowance for Loan Losses - Private Education Loan Portfolio Stratified by Key Credit Quality Indicators (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 10,596,437 | $ 8,311,376
Private Education Loans | Cosigners |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans with cosigner | 9,515,136 | 7,465,339
Private Education Loans without cosigner | $ 1,081,301 | $ 846,037
Private Education Loans with cosigner in percent | 90.00% | 90.00%
Private Education Loans without cosigner in percent | 10.00% | 10.00%
Total | $ 10,596,437 | $ 8,311,376
Total in percent | 100.00% | 100.00%
Private Education Loans | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 10,596,437 | $ 8,311,376
Total in percent | 100.00% | 100.00%
Private Education Loans | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 10,596,437 | $ 8,311,376
Seasoning - based on monthly scheduled payments due from 1-12 payments | 3,059,901 | 2,373,117
Seasoning - based on monthly scheduled payments due from 13-24 payments | 2,096,412 | 1,532,042
Seasoning - based on monthly scheduled payments due from 25-36 payments | 1,084,818 | 755,143
Seasoning - based on monthly scheduled payments due from 37-48 payments | 513,125 | 411,493
Seasoning - based on monthly scheduled payments due from more than 48 payments | 414,217 | 212,438
Seasoning - based on monthly scheduled payments due from not yet in repayment | $ 3,427,964 | $ 3,027,143
Seasoning based on monthly scheduled payments due from 1-12 payments, in percent | 29.00% | 29.00%
Seasoning based on monthly scheduled payments due from 13 - 24 payments, in percent | 20.00% | 18.00%
Seasoning based on monthly scheduled payments due from 25 - 36 payments, in percent | 10.00% | 9.00%
Seasoning based on monthly scheduled payments due from 37 - 48 payments, in percent | 5.00% | 5.00%
Seasoning based on monthly scheduled payments due from more than 48 payments, in percent | 4.00% | 3.00%
Seasoning - based on monthly scheduled payments due from not yet in repayment, in percent | 32.00% | 36.00%
Total in percent | 100.00% | 100.00%
FICO score greater than 670 | Private Education Loans | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 700,779 | $ 558,801
Total in percent | 7.00% | 7.00%
FICO score 670-709 | Private Education Loans | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 1,554,959 | $ 1,227,860
Total in percent | 15.00% | 15.00%
FICO score 710-749 | Private Education Loans | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 3,403,823 | $ 2,626,238
Total in percent | 32.00% | 32.00%
FICO score greater than 750 | Private Education Loans | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 4,936,876 | $ 3,898,477
Total in percent | 46.00% | 46.00%

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