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Summary of Restricted Stock Unit and Performance Share Transaction (Detail) | 12 Months Ended
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Dec. 31, 2013
Restricted stock units |  |
Number of Shares |  |
Outstanding beginning balance | 669,459 |
Granted | 320,318 |
Distributed (vested) | (207,468) |
Cancelled | (20,886) |
Outstanding at end of period | 761,423 | [1]
Vested or expected to vest | 761,423 |
Performance Shares |  |
Number of Shares |  |
Outstanding beginning balance | 2,190,778 |
Granted | 1,327,478 |
Cancelled | (188,038) |
Outstanding at end of period | 3,330,218 | [1]
Vested or expected to vest | 2,258,631 |
[1] | Outstanding performance shares are reflected at the maximum possible payout that may be earned during the relevant performance periods.

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- Definition Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Expected to Vest Outstanding Number + 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 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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