Employee Benefit Plans - Schedule of Estimated Future Benefit Payments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Chesapeake Pension Plan
Defined Benefit Plan, Expected Future Benefit Payments, Maturity [Line Items]
2014	$ 494
2015	622
2016	572
2017	1,071
2018	634
Years 2019 through 2023	3,984
FPU Pension Plan
Defined Benefit Plan, Expected Future Benefit Payments, Maturity [Line Items]
2014	2,814
2015	2,886
2016	2,946
2017	2,988
2018	3,048
Years 2019 through 2023	16,362
Chesapeake SERP
Defined Benefit Plan, Expected Future Benefit Payments, Maturity [Line Items]
2014	88
2015	138
2016	146
2017	143
2018	140
Years 2019 through 2023	890
Chesapeake Postretirement Plan
Defined Benefit Plan, Expected Future Benefit Payments, Maturity [Line Items]
2014	95
2015	97
2016	98
2017	96
2018	95
Years 2019 through 2023	436
FPU Medical Plan
Defined Benefit Plan, Expected Future Benefit Payments, Maturity [Line Items]
2014	245
2015	223
2016	203
2017	166
2018	133
Years 2019 through 2023	$ 393