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Cash Dividends Declared Per Ordinary Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividend Per Share | $ 0.0375 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.0375 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.0375 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.0375 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.0375 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.0375 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.0375 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.0375 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.15 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.15 us-gaap_CommonStockDividendsPerShareDeclared | $ 0 us-gaap_CommonStockDividendsPerShareDeclared
Amount | $ 5,084 us-gaap_DividendsCommonStockCash | $ 5,081 us-gaap_DividendsCommonStockCash | $ 5,060 us-gaap_DividendsCommonStockCash | $ 5,056 us-gaap_DividendsCommonStockCash | $ 4,935 us-gaap_DividendsCommonStockCash | $ 4,932 us-gaap_DividendsCommonStockCash | $ 5,042 us-gaap_DividendsCommonStockCash | $ 5,056 us-gaap_DividendsCommonStockCash | $ 20,281 us-gaap_DividendsCommonStockCash | $ 19,965 us-gaap_DividendsCommonStockCash |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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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