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Cash Dividends (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Dividends Payable [Line Items] |  |
Cash dividends paid, per share | $ 0.02 | $ 0.02
Cash dividends paid | $ 4,443 |
Installment 1, FY 2018 |  |
Dividends Payable [Line Items] |  |
Cash dividends paid, date | Mar. 22, 2018 |
Cash dividends paid, per share | $ 0.02 |
Cash dividends paid | $ 4,443 |
Installment 1, FY 2017 |  |
Dividends Payable [Line Items] |  |
Cash dividends paid, date |  | Mar. 22, 2017
Cash dividends paid, per share |  | $ 0.02
Cash dividends paid |  | $ 3,326

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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 Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + 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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