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Cash Dividends (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Dividends Payable [Line Items] |  |  |
Cash dividends paid, per share | $ 0.08 | $ 0.16 | $ 0.40
Cash dividends paid | $ 16,315 | $ 23,579 | $ 58,775
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 |  |
Installment 2, FY 2017 |  |  |
Dividends Payable [Line Items] |  |  |
Cash dividends paid, date | Jun. 22, 2017 |  |
Cash dividends paid, per share | $ 0.02 |  |
Cash dividends paid | $ 4,269 |  |
Installment 3, FY 2017 |  |  |
Dividends Payable [Line Items] |  |  |
Cash dividends paid, date | Sep. 21, 2017 |  |
Cash dividends paid, per share | $ 0.02 |  |
Cash dividends paid | $ 4,271 |  |
Installment 4, FY 2017 |  |  |
Dividends Payable [Line Items] |  |  |
Cash dividends paid, date | Dec. 21, 2017 |  |
Cash dividends paid, per share | $ 0.02 |  |
Cash dividends paid | $ 4,449 |  |
Installment 1, FY 2016 |  |  |
Dividends Payable [Line Items] |  |  |
Cash dividends paid, date |  | Mar. 24, 2016 |
Cash dividends paid, per share |  | $ 0.10 |
Cash dividends paid |  | $ 14,712 |
Installment 2, FY 2016 |  |  |
Dividends Payable [Line Items] |  |  |
Cash dividends paid, date |  | Jun. 23, 2016 |
Cash dividends paid, per share |  | $ 0.02 |
Cash dividends paid |  | $ 2,953 |
Installment 3, FY 2016 |  |  |
Dividends Payable [Line Items] |  |  |
Cash dividends paid, date |  | Sep. 22, 2016 |
Cash dividends paid, per share |  | $ 0.02 |
Cash dividends paid |  | $ 2,953 |
Installment 4, FY 2016 |  |  |
Dividends Payable [Line Items] |  |  |
Cash dividends paid, date |  | Dec. 22, 2016 |
Cash dividends paid, per share |  | $ 0.02 |
Cash dividends paid |  | $ 2,961 |
Installment 1, FY 2015 |  |  |
Dividends Payable [Line Items] |  |  |
Cash dividends paid, date |  |  | Mar. 25, 2015
Cash dividends paid, per share |  |  | $ 0.10
Cash dividends paid |  |  | $ 14,640
Installment 2, FY 2015 |  |  |
Dividends Payable [Line Items] |  |  |
Cash dividends paid, date |  |  | Jun. 24, 2015
Cash dividends paid, per share |  |  | $ 0.10
Cash dividends paid |  |  | $ 14,712
Installment 3, FY 2015 |  |  |
Dividends Payable [Line Items] |  |  |
Cash dividends paid, date |  |  | Sep. 24, 2015
Cash dividends paid, per share |  |  | $ 0.10
Cash dividends paid |  |  | $ 14,712
Installment 4, FY 2015 |  |  |
Dividends Payable [Line Items] |  |  |
Cash dividends paid, date |  |  | Dec. 24, 2015
Cash dividends paid, per share |  |  | $ 0.10
Cash dividends paid |  |  | $ 14,711

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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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