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Allowance for Loan Losses - Private Education Loan Portfolio Stratified by Key Credit Quality Indicators (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 9,312,937 | $ 8,311,376
Private Education Loans | Cosigners |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans with cosigner | 8,341,122 | 7,465,339
Private Education Loans without cosigner | 971,815 | 846,037
Total | $ 9,312,937 | $ 8,311,376
Private Education Loans with cosigner in percent | 90.00% | 90.00%
Private Education Loans without cosigner in percent | 10.00% | 10.00%
Total in percent | 100.00% | 100.00%
Private Education Loans | FICO at Origination |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 9,312,937 | $ 8,311,376
Total in percent | 100.00% | 100.00%
Private Education Loans | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 9,312,937 | $ 8,311,376
Total in percent | 100.00% | 100.00%
Seasoning - based on monthly scheduled payments due from 1-12 payments | $ 3,052,670 | $ 2,373,117
Seasoning - based on monthly scheduled payments due from 13-24 payments | 1,545,880 | 1,532,042
Seasoning - based on monthly scheduled payments due from 25-36 payments | 773,371 | 755,143
Seasoning - based on monthly scheduled payments due from 37-48 payments | 380,153 | 411,493
Seasoning - based on monthly scheduled payments due from more than 48 payments | 256,692 | 212,438
Seasoning - based on monthly scheduled payments due from not yet in repayment | $ 3,304,171 | $ 3,027,143
Seasoning based on monthly scheduled payments due from 1-12 payments, in percent | 33.00% | 29.00%
Seasoning based on monthly scheduled payments due from 13 - 24 payments, in percent | 17.00% | 18.00%
Seasoning based on monthly scheduled payments due from 25 - 36 payments, in percent | 8.00% | 9.00%
Seasoning based on monthly scheduled payments due from 37 - 48 payments, in percent | 4.00% | 5.00%
Seasoning based on monthly scheduled payments due from more than 48 payments, in percent | 3.00% | 3.00%
Seasoning - based on monthly scheduled payments due from not yet in repayment, in percent | 35.00% | 36.00%
FICO score less than 670 | Private Education Loans | FICO at Origination |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 614,918 | $ 558,801
Total in percent | 6.00% | 7.00%
FICO score 670-699 | Private Education Loans | FICO at Origination |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 1,371,546 | $ 1,227,860
Total in percent | 15.00% | 15.00%
FICO score 700-749 | Private Education Loans | FICO at Origination |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 2,970,077 | $ 2,626,238
Total in percent | 32.00% | 32.00%
FICO score greater than or equal to 750 | Private Education Loans | FICO at Origination |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 4,356,396 | $ 3,898,477
Total in percent | 47.00% | 46.00%

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