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Stockholders' Equity - Cash Dividends (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Dividends Payable [Line Items] |  |  |  |
Per Share Amount | $ 0.09 | $ 0.09 | $ 0.27 | $ 0.27
Total Dividend Paid |  |  | $ 12,976 | $ 13,031
Cash Dividends Paid in February [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Record Date |  |  | Jan. 31, 2018 |
Payment Date |  |  | Feb. 14, 2018 |
Per Share Amount |  |  | $ 0.09 |
Total Dividend Paid |  |  | $ 4,367 |
Cash Dividends Paid in May [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Record Date |  |  | May 02, 2018 |
Payment Date |  |  | May 16, 2018 |
Per Share Amount |  |  | $ 0.09 |
Total Dividend Paid |  |  | $ 4,312 |
Cash Dividends Paid in August [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Record Date |  |  | Aug. 01, 2018 |
Payment Date |  |  | Aug. 15, 2018 |
Per Share Amount |  |  | $ 0.09 |
Total Dividend Paid |  |  | $ 4,297 |

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