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Stock-Based Compensation - Additional Information (Detail) (USD $) | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Maximum | May 31, 2011 2011 Omnibus Incentive Plan | Dec. 31, 2013 Stock Option | Dec. 31, 2012 Stock Option | Dec. 31, 2011 Stock Option | Dec. 31, 2013 Restricted Stock | Dec. 31, 2012 Restricted Stock | Dec. 31, 2011 Restricted Stock | Mar. 31, 2010 Stock Appreciation Rights SARS | Dec. 31, 2013 Stock Appreciation Rights SARS | Dec. 31, 2012 Stock Appreciation Rights SARS | Dec. 31, 2011 Stock Appreciation Rights SARS | Mar. 31, 2010 Performance Shares | Dec. 31, 2013 Performance Shares | Mar. 31, 2010 Cash Settled Performance Units and Stock Appreciation Rights | Dec. 31, 2012 Cash Settled Performance Units and Stock Appreciation Rights | Dec. 31, 2011 Cash Settled Performance Units and Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  |  | 7,500,000 | 1,999,688 | 1,882,554 |  | 1,146,931 | 773,950 |  |  |  |  |  |  |  |  |  |
Stock-based compensation | $ 7,480,000 | $ 5,149,000 | $ 3,398,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 1 year 8 months 12 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation costs related to stock options, nonvested restricted stock, stock appreciation rights and performance units not yet recognized | 7,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation arrangement by share based payment award options grants in period |  |  |  |  |  | 361,220 | 487,950 | 410,531 | 521,181 | 404,250 | 377,869 | 326,250 |  |  |  | 434,661 |  |  |  |
Share based compensation arrangement by share based payment award options grant date fair value |  |  |  |  |  | 2,200,000 | 3,400,000 | 2,700,000 | 5,000,000 | 4,000,000 | 3,700,000 |  |  |  |  |  |  |  |  |
Share based compensation arrangement by share based payment award options grants in period weighted average grant date fair value |  |  |  |  |  | $ 6.13 | $ 6.94 | $ 6.70 |  |  |  |  |  | $ 1.52 | $ 2.68 |  |  |  | $ 7.45 | $ 7.45
Exercised, Aggregate Intrinsic Value |  |  |  |  |  | 300,000 | 300,000 | 400,000 |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation arrangement by share based payment award option vested in period fair value |  |  |  |  |  |  |  |  | $ 600,000 | $ 1,900,000 | $ 1,900,000 |  | $ 800,000 |  |  |  | $ 3,000,000 |  |  |
Share based compensation arrangement by share based payment award vesting period |  |  |  | 10 years |  | 3 years |  |  | 3 years |  |  |  |  |  |  |  | 3 years | 3 years |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(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 Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Share-based compensation arrangement by share-based payment award options fair value of options on grant date. + References No definition available. + Details
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