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Cash Dividend Distribution - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 1 Months Ended | 6 Months Ended | 1 Months Ended
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Apr. 30, 2013 | Feb. 22, 2013 | Jan. 15, 2013 | Jun. 30, 2013 | Jul. 30, 2013 Subsequent Events [Member]
Dividends Payable [Line Items] |  |  |  |  |
Cash dividend distribution | $ 6.3 | $ 6.3 | $ 4.8 |  |
Cash dividend declared, per share | $ 0.143 | $ 0.143 | $ 0.109 |  |
Dividend paid date |  |  |  | Jan. 15, 2013 |
Dividend paid date | Jul. 15, 2013 | Apr. 15, 2013 |  |  | Oct. 15, 2013
Cash dividend declared |  |  |  |  | $ 6.3
Cash dividend declared, per share |  |  |  |  | $ 0.143

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