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Subsequent Event - Additional Information (Detail) (USD $) | 12 Months Ended |  |  | 1 Months Ended |  | 1 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 31, 2011 Common Shares [Member] | Jan. 24, 2011 Common Shares [Member] | Jan. 28, 2014 Subsequent Event [Member] Common Shares [Member] | Jan. 31, 2014 Subsequent Event [Member] Common Shares [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |
Common stock, shares issued |  | 116,494,000 | 115,259,000 |  | 19,000,000 | 9,775,000 |
Proceeds from sale of common stock | $ 219,783,000 |  |  | $ 220,400,000 |  | $ 117,200,000 | $ 117,200,000
Legal, accounting fees, filing fees and other offering expenses |  |  |  | $ 600,000 |  | $ 600,000 | $ 600,000

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + 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 cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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