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Capital Stock - Additional Information (Detail) (USD $) | 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, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Class Of Stock Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized capital stock | 485,000,000 us-gaap_CapitalUnitsAuthorized |  |  |  | 485,000,000 us-gaap_CapitalUnitsAuthorized |  |  |  |  |  |  |  | 485,000,000 us-gaap_CapitalUnitsAuthorized | 485,000,000 us-gaap_CapitalUnitsAuthorized |
Common stock, shares authorized | 475,000,000 us-gaap_CommonStockSharesAuthorized |  |  |  | 475,000,000 us-gaap_CommonStockSharesAuthorized |  |  |  |  |  |  |  | 475,000,000 us-gaap_CommonStockSharesAuthorized | 475,000,000 us-gaap_CommonStockSharesAuthorized |
Preferred stock, shares authorized | 10,000,000 us-gaap_PreferredStockSharesAuthorized |  |  |  | 10,000,000 us-gaap_PreferredStockSharesAuthorized |  |  |  |  |  |  |  | 10,000,000 us-gaap_PreferredStockSharesAuthorized | 10,000,000 us-gaap_PreferredStockSharesAuthorized |
Common dividends declared per share | $ 0.04 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.04 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.04 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.04 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.04 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.04 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.04 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.04 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.04 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.04 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.04 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.04 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.16 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.16 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.16 us-gaap_CommonStockDividendsPerShareDeclared

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- Definition Number of authorized capital units or capital shares. This element is relevant to issuers of face-amount certificates and registered investment companies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.16(a)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 + Details
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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 The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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