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Subsequent Event - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2016 | Feb. 19, 2016
Subsequent Event [Line Items] |  |  |  |  |
Goodwill | $ 924,847 | $ 897,933 |  |  |
Goodwill impairment | 49,277 | 0 | $ 0 |  |
Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Percentage of membership interest |  |  |  |  | 100.00%
Tax Lien Transfer [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Goodwill | 0 | $ 49,277 |  |  |
Goodwill impairment | $ 49,277 |  |  |  |
Propel [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Earnings per share, after income taxes related to goodwill impairment (in dollars per share) | $ 1.17 |  |  |  |
Propel [Member] | Tax Lien Transfer [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Goodwill | $ 49,300 |  |  |  |
Percent of revenue attributable to segment | 3.00% | 3.00% | 2.00% |  |
Goodwill impairment | $ 49,300 |  |  |  |
Percent of operating income attributable to segment | 4.00% | 3.00% | 2.00% |  |
Scenario, Forecast [Member] | Propel [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Enterprise value |  |  |  | $ 344,300 |
Consideration payable to Company |  |  |  | $ 142,800 |

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