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Stockholders' Equity - Summary of Stock Options Granted (Details) (USD $) | 77 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2013 April 16, 2013 [Member] | Sep. 30, 2013 April 17, 2012 [Member] | Sep. 30, 2013 April 19, 2011 [Member] | Sep. 30, 2013 April 20, 2010 [Member] | Sep. 30, 2013 April 21, 2009 [Member] | Sep. 30, 2013 April 15, 2008 [Member] | Sep. 30, 2013 April 17, 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Options granted | 8,100,000 | 205,000 | 1,235,000 | 410,000 | 530,000 | 790,000 | 550,000 | 4,380,000
Option exercise (strike) price |  | $ 54 | $ 54.00 | $ 35.00 | $ 30.00 | $ 27.00 | $ 27.00 | $ 22.50
Closing stock price on date of grant |  | $ 49.25 | $ 49.01 | $ 31.78 | $ 27.13 | $ 17.61 | $ 24.35 | $ 20.15
Options outstanding | 4,395,605 | 177,500 | 1,132,500 | 360,000 | 300,000 | 413,600 | 216,000 | 1,796,005
Options vested | 1,414,855 | 0 | 0 | 0 | 0 | 173,600 | 114,750 | 1,126,505

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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Price of a single share of a number of saleable stocks of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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