Other Liabilities - Summary of Other Liabilities (Parenthetical) (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended |
---|---|---|
Sep. 30, 2018 |
Sep. 30, 2018 |
|
Other Liabilities Disclosure [Line Items] | ||
Amortization period of Legacy facilities credit as reduction to cost of sales | 40 years | |
Legacy Facilities Credit [Member] | ||
Other Liabilities Disclosure [Line Items] | ||
Amount of compensation paid | $ 44.3 | |
CCR [Member] | Legacy Facilities Credit [Member] | ||
Other Liabilities Disclosure [Line Items] | ||
Amortization period of Legacy facilities credit as reduction to cost of sales | 40 years |