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Quarterly Financial Data (Unaudited) - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Bargain purchase gain |  | $ 14,600 |  |  |  |  |  |  | $ 0 | $ 14,577 | $ 0
Net Income | $ 14,829 | 13,958 | $ 13,983 | $ 11,053 | $ 5,928 | $ 21,800 | $ 11,042 | $ 10,991 | $ 53,823 | $ 49,761 | $ 39,857
Effect of Change in Accounting Principle [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Bargain purchase gain |  | $ 8,000 |  |  |  |  |  |  |  |  |
As Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  | $ 13,300 |  |  |  |  |

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