Employee Benefit Plans - Schedule of Estimated Future Benefit Payments (Detail) $ in Thousands	Dec. 31, 2015 USD ($)
Chesapeake Pension Plan
Defined Benefit Plan, Expected Future Benefit Payments, Maturity [Line Items]
2014	$ 591	[1]
2015	717	[1]
2016	640	[1]
2017	686	[1]
2018	646	[1]
Years 2019 through 2023	4,706	[1]
FPU Pension Plan
Defined Benefit Plan, Expected Future Benefit Payments, Maturity [Line Items]
2014	2,980	[1]
2015	3,000	[1]
2016	3,047	[1]
2017	3,129	[1]
2018	3,218	[1]
Years 2019 through 2023	17,469	[1]
Chesapeake SERP
Defined Benefit Plan, Expected Future Benefit Payments, Maturity [Line Items]
2014	151	[2]
2015	150	[2]
2016	150	[2]
2017	148	[2]
2018	147	[2]
Years 2019 through 2023	960	[2]
Chesapeake Postretirement Plan
Defined Benefit Plan, Expected Future Benefit Payments, Maturity [Line Items]
2014	82	[2]
2015	80	[2]
2016	79	[2]
2017	79	[2]
2018	73	[2]
Years 2019 through 2023	322	[2]
FPU Medical Plan
Defined Benefit Plan, Expected Future Benefit Payments, Maturity [Line Items]
2014	149	[2]
2015	130	[2]
2016	93	[2]
2017	100	[2]
2018	94	[2]
Years 2019 through 2023	$ 424	[2]

[1] The pension plan is funded; therefore, benefit payments are expected to be paid out of the plan assets.

[2] Benefit payments are expected to be paid out of our general funds.