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Cash Dividends (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid, per share |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.10 | $ 0.16 | $ 0.14
Cash dividends paid |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,862 | $ 32,428 | $ 30,589
Installment 1, FY 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid, date |  |  |  | Mar. 19, 2020 |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid, per share |  |  |  | $ 0.04 |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid |  |  |  | $ 7,629 |  |  |  |  |  |  |  |  |  |  |
Installment 2, FY 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid, date |  |  | Jun. 18, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid, per share |  |  | $ 0.02 |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid |  |  | $ 3,735 |  |  |  |  |  |  |  |  |  |  |  |
Installment 3, FY 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid, date |  | Sep. 17, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid, per share |  | $ 0.02 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid |  | $ 3,746 |  |  |  |  |  |  |  |  |  |  |  |  |
Installment 4, FY 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid, date | Dec. 17, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid, per share | $ 0.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid | $ 3,752 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Installment 1, FY 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid, date |  |  |  |  |  |  |  | Mar. 21, 2019 |  |  |  |  |  |  |
Cash dividends paid, per share |  |  |  |  |  |  |  | $ 0.04 |  |  |  |  |  |  |
Cash dividends paid |  |  |  |  |  |  |  | $ 8,499 |  |  |  |  |  |  |
Installment 2, FY 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid, date |  |  |  |  |  |  | Jun. 20, 2019 |  |  |  |  |  |  |  |
Cash dividends paid, per share |  |  |  |  |  |  | $ 0.04 |  |  |  |  |  |  |  |
Cash dividends paid |  |  |  |  |  |  | $ 8,344 |  |  |  |  |  |  |  |
Installment 3, FY 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid, date |  |  |  |  |  | Sep. 19, 2019 |  |  |  |  |  |  |  |  |
Cash dividends paid, per share |  |  |  |  |  | $ 0.04 |  |  |  |  |  |  |  |  |
Cash dividends paid |  |  |  |  |  | $ 7,847 |  |  |  |  |  |  |  |  |
Installment 4, FY 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid, date |  |  |  |  | Dec. 19, 2019 |  |  |  |  |  |  |  |  |  |
Cash dividends paid, per share |  |  |  |  | $ 0.04 |  |  |  |  |  |  |  |  |  |
Cash dividends paid |  |  |  |  | $ 7,738 |  |  |  |  |  |  |  |  |  |
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 2, FY 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid, date |  |  |  |  |  |  |  |  |  |  | Jun. 21, 2018 |  |  |  |
Cash dividends paid, per share |  |  |  |  |  |  |  |  |  |  | $ 0.04 |  |  |  |
Cash dividends paid |  |  |  |  |  |  |  |  |  |  | $ 8,832 |  |  |  |
Installment 3, FY 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid, date |  |  |  |  |  |  |  |  |  | Sep. 20, 2018 |  |  |  |  |
Cash dividends paid, per share |  |  |  |  |  |  |  |  |  | $ 0.04 |  |  |  |  |
Cash dividends paid |  |  |  |  |  |  |  |  |  | $ 8,685 |  |  |  |  |
Installment 4, FY 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid, date |  |  |  |  |  |  |  |  | Dec. 20, 2018 |  |  |  |  |  |
Cash dividends paid, per share |  |  |  |  |  |  |  |  | $ 0.04 |  |  |  |  |  |
Cash dividends paid |  |  |  |  |  |  |  |  | $ 8,629 |  |  |  |  |  |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120397183&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 + Details
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