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Financing Arrangements - Additional Information (Detail) - USD ($) | Jun. 30, 2015 | Jan. 05, 2015 | Dec. 31, 2014 | Dec. 19, 2014 | Jan. 30, 2014
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Loans outstanding |  | $ 0 |  |  |
7.50% Subordinated Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal available |  |  |  |  | $ 150,000,000
Debt instrument, interest rate, stated percentage |  |  |  |  | 7.50%
Series B Preferred Stock [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Preferred stock, shares issued | 600,000 | 600,000 | 0 |  |
Affiliates of KKR [Member] | Series B Preferred Stock [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Preferred stock, shares issued |  |  |  | 200,000 |

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