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Employee Benefit Plans - Summary of Weighted-Average Assets Allocation (Detail) - Pension Plan [Member]
Dec. 31, 2016
Weighted-Average Assets Allocation  
Cash equivalencies 100.00%
Equity Securities [Member]  
Weighted-Average Assets Allocation  
Cash equivalencies 28.92%
Fixed Income [Member]  
Weighted-Average Assets Allocation  
Cash equivalencies 71.08%