Basis of Presentation (Details)	9 Months Ended
	Sep. 30, 2016 plan
Revenue Recognition [Abstract]
Period for sprint's waiver of the management fee	6 years
Contract term	14 years
Pension Benefits and Retirement Benefits Other Than Pensions [Abstract]
Vesting period of pension benefits	5 years
Number of consecutive years considered for pension benefits	5 years
Employee retires before reaching the age, elect to receive the benefit	65 years
Number of preceding plan years	6 years
Number of qualified nonpension postretirement benefit plans	2
Minimum [Member]
Pension Benefits and Retirement Benefits Other Than Pensions [Abstract]
Eligibility for the life insurance plan is restricted to active pension participants	50 years
Maximum [Member]
Pension Benefits and Retirement Benefits Other Than Pensions [Abstract]
Eligibility for the life insurance plan is restricted to active pension participants	64 years