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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Equity [Abstract] |  |  |  |  |
Cash Dividend on Common Stock | $ 0.85 | $ 0.85 | $ 0.80 | $ 1.70 | $ 1.60
Aggregated Dividend Paid | $ 43.6 | $ 43.6 |  |  |
Dividend payable date declared | Jun. 18, 2018 | Feb. 23, 2018 |  |  |
Common stock Dividend Payable Date | Jul. 16, 2018 | Apr. 16, 2018 |  |  |
Dividend payable date of record | Jun. 29, 2018 | Mar. 30, 2018 |  |  |

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