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Summary of Performance Units Activity (Detail) (Performance Units, USD $) | 9 Months Ended
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Sep. 30, 2013
Performance Units |  |
Number of Share Units |  |
Outstanding number of Shares (Units), beginning balance | 3,041,511 |
Granted, number of Shares (Units) | 2,025,090 |
Vested, number of shares (Units) |  |
Forfeited, number of shares (Units) | (200,654) |
Addition due to achievement of higher than target performance goals, number of shares (Units) | 297,911 | [1]
Outstanding number of shares (Units), ending balance | 5,163,858 |
Expected to vest | 2,542,867 | [2]
Weighted Average Grant Date Fair Value |  |
Outstanding weighted average grant date fair value, beginning balance | $ 13.26 |
Granted, weighted average grant date fair value | $ 18.57 |
Vested, weighted average grant date fair value |  |
Forfeited, weighted average grant date fair value | $ 15.13 |
Addition due to achievement of higher than target performance goals | $ 17.50 | [1]
Outstanding weighted Average Grant Date Fair Value, ending balance | $ 15.51 |
Maximum shares eligible to receive |  |
Outstanding maximum shares eligible to receive, beginning balance | 4,402,597 |
Granted, maximum shares eligible to receive | 3,694,635 |
Vested, maximum shares eligible to receive |  |
Forfeited, maximum shares eligible to receive | (256,064) |
Reduction due to achievement of lower than maximum performance goals, maximum shares eligible to receive | (373,702) | [3]
Outstanding maximum shares eligible to receive, ending balance | 7,467,466 |
[1] | Represents the additional award of 22.2% of the target shares on account of the achievement of higher than target performance for the PUs granted in March 2012.
[2] | PUs expected to vest are based on the probable achievement of the performance targets after considering an estimated forfeiture rate
[3] | Represents a 27.8% reduction in the maximum shares eligible to vest on account of the certification of the performance goals for the PUs granted in 2012.

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- Definition Increase/decrease in the 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) pertaining to the achievement of specified targets basis certification by the compensation committee. + 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 Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 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 weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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