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Parent Only Statements - Statements of Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash flows from operating activities: |  |  |  |  |  |  |  |
Net income | $ 19,717 | $ 82,926 | $ 44,128 | $ 47,014 | $ 274,284 | $ 193,785 | $ 257,593 |
Adjustments to reconcile net income to net cash (used in) provided by operating activities: |  |  |  |  |  |  |  |
Interest income on tax indemnification receivable |  |  |  |  | (5,398) | (5,904) | 0 |
Decrease in tax indemnification receivable |  |  |  |  | 59,633 | 44,724 | 0 |
Increase in other assets |  |  |  |  | (18,070) | (24,959) | (2,357) |
Increase (decrease) in income tax payable, net |  |  |  |  | 56,813 | (221,222) | 56,784 |
(Decrease) increase in payable due to entity that is a subsidiary of Navient |  |  |  |  | (6,774) | 8,764 | 147,379 |
Increase in other liabilities |  |  |  |  | (14,731) | (2,652) | 39,096 |
Total adjustments |  |  |  |  | (365,487) | (630,558) | (187,573) |
Total net cash (used in) provided by operating activities |  |  |  |  | (91,203) | (436,773) | 70,020 |
Cash flows from investing activities: |  |  |  |  |  |  |  |
Net cash provided by (used in) investing activities |  |  |  |  | (1,847,509) | (1,388,371) | (731,116) |
Cash flows from financing activities: |  |  |  |  |  |  |  |
Special cash contribution from Navient |  |  |  |  | 0 | 472,718 | 0 |
Excess tax benefit from the exercise of stock-based awards |  |  |  |  | 6,140 | 3,271 | 6,258 |
Preferred stock dividends paid |  |  |  |  | (19,595) | (12,933) | 0 |
Net cash (used in) provided by financing activities |  |  |  |  | 1,995,151 | 2,002,059 | 1,244,879 |
Net (decrease) increase in cash and cash equivalents |  |  |  |  | 56,439 | 176,915 | 583,783 |
Cash and cash equivalents | 2,359,780 |  |  |  | 2,416,219 | 2,359,780 | 2,182,865 | $ 1,599,082
Cash and cash equivalents at end of year | 2,359,780 |  |  |  | 2,416,219 | 2,359,780 | 2,182,865 |
Parent Company |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |
Net income |  |  |  |  | 274,284 | 193,785 | 257,593 |
Adjustments to reconcile net income to net cash (used in) provided by operating activities: |  |  |  |  |  |  |  |
Undistributed earnings of subsidiaries |  |  |  |  | (295,638) | (211,479) | (394,270) |
Interest income on tax indemnification receivable |  |  |  |  | (5,398) | (5,904) | 0 |
(Increase) decrease in investment in subsidiaries, net |  |  |  |  | (103,602) | 278,365 | 136,677 |
Decrease in tax indemnification receivable |  |  |  |  | 59,633 | 44,724 | 0 |
Decrease (increase) in due from subsidiaries, net |  |  |  |  | 11,012 | (32,408) | 0 |
Increase in other assets |  |  |  |  | (14,366) | (5,447) | 0 |
Increase (decrease) in income tax payable, net |  |  |  |  | (54,907) | (312,770) | 0 |
(Decrease) increase in payable due to entity that is a subsidiary of Navient |  |  |  |  | (6,774) | 8,764 | 0 |
Increase in other liabilities |  |  |  |  | 1,402 | 14,398 | 0 |
Total adjustments |  |  |  |  | (408,638) | (221,757) | (257,593) |
Total net cash (used in) provided by operating activities |  |  |  |  | (134,354) | (27,972) | 0 |
Cash flows from investing activities: |  |  |  |  |  |  |  |
Net cash provided by (used in) investing activities |  |  |  |  | 0 | 0 | 0 |
Cash flows from financing activities: |  |  |  |  |  |  |  |
Special cash contribution from Navient |  |  |  |  | 0 | 472,718 | 0 |
Excess tax benefit from the exercise of stock-based awards |  |  |  |  | 1,740 | 2,432 | 0 |
Preferred stock dividends paid |  |  |  |  | (19,595) | (12,933) | 0 |
Net cash (used in) provided by financing activities |  |  |  |  | (17,855) | 462,217 | 0 |
Net (decrease) increase in cash and cash equivalents |  |  |  |  | (152,209) | 434,245 | 0 |
Cash and cash equivalents | 434,245 |  |  |  | 282,036 | 434,245 | 0 | $ 0
Cash and cash equivalents at end of year | $ 434,245 |  |  |  | $ 282,036 | $ 434,245 | $ 0 |

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