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Income Taxes - Narrative (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Taxes [Line Items] |  |  |  |  |
Provision for income taxes |  | $ (13,597) | $ (52,725) | $ (45,388) |
Effective tax rate (percent) |  | 22.30% | 34.60% | 37.60% |
Net benefit for state taxes rate (percent) |  | (0.40%) | 2.90% | 2.00% |
Provision for state taxes rate (percent) |  | (1.20%) | 8.20% | 5.80% |
Net benefit (percent) |  | 3.40% | (6.40%) | (1.20%) |
Valuation allowance |  | $ 4,517 | $ 10,047 |  |
Federal income tax rate (percent) |  | 35.00% | 35.00% | 35.00% |
Undistributed earnings |  | $ 35,100 |  |  |
Unrecognized tax benefit |  | 47,949 | $ 38,425 | $ 71,273 | $ 1,784
Unrecognized tax benefits, including penalties and interest |  |  | 44,400 |  | 83,000
Net tax benefit from unrecognized tax benefits, if recognized |  | 14,900 | 12,700 |  | $ 13,500
Decrease related to settlements with tax authorities |  | 32,000 | 67,204 |  |
Unrecognized tax benefits, income tax penalties and interest expense |  | 300 | $ 1,300 |  |
Foreign Subsidiaries [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss carry forward |  | 63,500 |  |  |
Domestic Subsidiaries [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss carry forward |  | 1,600 |  |  |
Settlement with Taxing Authority [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Provision for income taxes |  | 6,600 |  |  |
AACC Merger [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Unrecognized tax benefits, including penalties and interest |  | $ 58,500 |  |  |
Tax Holiday Through December 31, 2018 [Member] | Costa Rica [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Holiday tax rate |  | 100.00% |  |  |
Subsequent Four Years [Member] | Costa Rica [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Holiday tax rate |  | 50.00% |  |  |
Income tax holiday, term |  | 4 years |  |  |
Consent Order, Consumer Finance Protection Bureau [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Litigation settlement penalty | $ 10,000 |  |  |  |

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