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Stockholders' Equity - Summary of Changes in Common Shares Available for Awards under 2005 Contingent Stock Plan (Detail) (USD $) | 12 Months Ended |  |  |  |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Restricted Stock SLO Awards [Member] | Dec. 31, 2012 Restricted Stock SLO Awards [Member] | Dec. 31, 2011 Restricted Stock SLO Awards [Member] | Dec. 31, 2013 2005 Contingent Stock Plan [Member] | Dec. 31, 2012 2005 Contingent Stock Plan [Member] | Dec. 31, 2011 2005 Contingent Stock Plan [Member] | Dec. 31, 2010 2005 Contingent Stock Plan [Member] | Dec. 31, 2013 2005 Contingent Stock Plan [Member] Restricted Stock [Member] | Dec. 31, 2012 2005 Contingent Stock Plan [Member] Restricted Stock [Member] | Dec. 31, 2011 2005 Contingent Stock Plan [Member] Restricted Stock [Member] | Dec. 31, 2013 2005 Contingent Stock Plan [Member] Restricted Stock Units (RSUs) [Member] | Dec. 31, 2012 2005 Contingent Stock Plan [Member] Restricted Stock Units (RSUs) [Member] | Dec. 31, 2011 2005 Contingent Stock Plan [Member] Restricted Stock Units (RSUs) [Member] | Dec. 31, 2013 2005 Contingent Stock Plan [Member] Restricted Stock SLO Awards [Member] | Dec. 31, 2012 2005 Contingent Stock Plan [Member] Restricted Stock SLO Awards [Member] | Dec. 31, 2011 2005 Contingent Stock Plan [Member] Restricted Stock SLO Awards [Member] | Dec. 31, 2013 2005 Contingent Stock Plan [Member] Restricted Stock Units RSU SLO Awards [Member] | Dec. 31, 2012 2005 Contingent Stock Plan [Member] Restricted Stock Units RSU SLO Awards [Member] | Dec. 31, 2011 2005 Contingent Stock Plan [Member] Restricted Stock Units RSU SLO Awards [Member] | Dec. 31, 2011 2009 Two-year PSU Awards [Member] | Dec. 31, 2013 2009 Three-year PSU Awards [Member] | Dec. 31, 2012 2009 Three-year PSU Awards [Member] | Dec. 31, 2013 2010 Three-year PSU Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available, beginning of year |  |  |  |  |  |  | 5,562,935 | 6,426,953 | 7,909,064 | 4,997,297 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional restricted stock shares available due to 2011 amendment to the 2005 Contingent Stock Plan |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock shares awarded |  |  |  | (51,321) | (135,343) | (24,515) |  |  |  |  | (398,230) | (703,620) | (308,650) | (187,595) | (191,700) | (133,650) | (21,505) | (3,788) | (6,080) | (51,033) | (6,795) | (28,516) | (1,114,139) |  | (1,155,018) | (472,865)
Restricted stock shares forfeited |  |  |  |  |  |  |  |  |  |  | 40,100 | 41,700 | 41,400 | 3,500 | 12,200 | 3,500 |  |  |  |  |  |  |  |  |  |
Shares withheld for taxes | 223,610 | 524,910 | 457,902 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available, end of year |  |  |  |  |  |  | 5,562,935 | 6,426,953 | 7,909,064 | 4,997,297 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average per share market value of awards on grant date |  |  |  |  |  |  | $ 27.20 | $ 17.19 | $ 24.93 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options additional units available in period. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options withheld for taxes in period. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 + Details
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