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2012 Incentive Compensation Plan - Summary of SAR Awards Transactions (Detail) - $ / shares | Oct. 19, 2015 | Jun. 06, 2012
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SAR I [Member] | Chief Operating Officer [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award |  | 543,872
Exercise Price |  | $ 22.07
Expiration |  | Jun. 06, 2022
SAR II [Member] | Chief Financial Officer [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award | 60,000 |
Exercise Price | $ 24.41 |
Expiration | Oct. 19, 2025 |

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- Definition Date the equity-based award expires, in CCYY-MM-DD format. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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