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Employee Benefit Plans - Schedule of Estimated Future Benefit Payments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012
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Chesapeake Pension Plan [Member] |
Defined Benefit Plan, Expected Future Benefit Payments, Maturity [Line Items] |
2013 | $ 564
2014 | 496
2015 | 628
2016 | 576
2017 | 1,194
Years 2018 through 2022 | 3,945
FPU Pension Plan [Member] |
Defined Benefit Plan, Expected Future Benefit Payments, Maturity [Line Items] |
2013 | 2,816
2014 | 2,881
2015 | 2,930
2016 | 2,974
2017 | 3,006
Years 2018 through 2022 | 16,037
Chesapeake SERP [Member] |
Defined Benefit Plan, Expected Future Benefit Payments, Maturity [Line Items] |
2013 | 88
2014 | 86
2015 | 136
2016 | 143
2017 | 141
Years 2018 through 2022 | 654
Chesapeake Postretirement Plan [Member] |
Defined Benefit Plan, Expected Future Benefit Payments, Maturity [Line Items] |
2013 | 97
2014 | 99
2015 | 101
2016 | 98
2017 | 97
Years 2018 through 2022 | 451
FPU Medical Plan [Member] |
Defined Benefit Plan, Expected Future Benefit Payments, Maturity [Line Items] |
2013 | 258
2014 | 241
2015 | 221
2016 | 183
2017 | 147
Years 2018 through 2022 | $ 441

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- Definition Amount of benefits expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the next fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the fifth fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the fourth fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the third fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the second fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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