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Equity (Detail) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Mar. 11, 2016 | Sep. 30, 2016
Subsidiary, Sale of Stock [Line Items] |  |
Direct offering costs | $ 800 | $ 830
Net proceeds received | $ 141,500 |
Common Stock |  |
Subsidiary, Sale of Stock [Line Items] |  |
Shares of common stock included in offering | 7,500,000 |

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