Employee Benefit Plans - Summary of Weighted-Average Asset Allocations by Asset Category (Detail) |
12 Months Ended | |
---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
|
Defined Benefit Plan Assets Target Allocations [Line Items] | ||
Total | 100.00% | 100.00% |
Equity Securities [Member] | ||
Defined Benefit Plan Assets Target Allocations [Line Items] | ||
Target Allocation Minimum | 55.00% | |
Target Allocation Maximum | 75.00% | |
Total | 62.00% | 61.00% |
Debt Securities [Member] | ||
Defined Benefit Plan Assets Target Allocations [Line Items] | ||
Target Allocation Minimum | 25.00% | |
Target Allocation Maximum | 55.00% | |
Total | 35.00% | 34.00% |
Cash and Cash Equivalents [Member] | ||
Defined Benefit Plan Assets Target Allocations [Line Items] | ||
Target Allocation Minimum | 0.00% | |
Target Allocation Maximum | 5.00% | |
Total | 3.00% | 5.00% |