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Earnings and Dividends per Share - Schedule of Dividends Payable (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 6 Months Ended
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Jun. 30, 2013
Record Date One [Member] |
Dividends Payable [Line Items] |
Dividend per share | $ 0.035
Record Date | Mar. 20, 2012
Payment Date | Mar. 30, 2012
Payments | $ 512
Record Date Two [Member] |
Dividends Payable [Line Items] |
Dividend per share | $ 0.035
Record Date | Jun. 15, 2012
Payment Date | Jun. 29, 2012
Payments | 512
Record Date Three [Member] |
Dividends Payable [Line Items] |
Dividend per share | $ 0.050
Record Date | Mar. 18, 2013
Payment Date | Mar. 28, 2013
Payments | 886
Record Date Four [Member] |
Dividends Payable [Line Items] |
Dividend per share | $ 0.050
Record Date | Jun. 14, 2013
Payment Date | Jun. 28, 2013
Payments | $ 881

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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=6367179&loc=d3e4304-108586 + Details
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Period Type: | duration

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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + 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=6367179&loc=d3e4304-108586 + Details
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- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + 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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- Details
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