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Stockholders' Equity - Cash Dividends (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Dividends Payable [Line Items] |  |  |  |
Per Share Amount | $ 0.09 | $ 0.09 | $ 0.27 | $ 0.27
Total Dividend Paid |  |  | $ 13,031 | $ 13,230
Cash Dividends Paid in February [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Record Date |  |  | Feb. 02, 2017 |
Payment Date |  |  | Feb. 16, 2017 |
Per Share Amount |  |  | $ 0.09 |
Total Dividend Paid |  |  | $ 4,369 |
Cash Dividends Paid in May [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Record Date |  |  | May 04, 2017 |
Payment Date |  |  | May 18, 2017 |
Per Share Amount |  |  | $ 0.09 |
Total Dividend Paid |  |  | $ 4,350 |
Cash Dividends Paid in August [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Record Date |  |  | Aug. 03, 2017 |
Payment Date |  |  | Aug. 17, 2017 |
Per Share Amount |  |  | $ 0.09 |
Total Dividend Paid |  |  | $ 4,312 |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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