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Summary of Significant Accounting Policies and Basis of Presentation - Property And Equipment Estimated Useful Lives (Detail)
12 Months Ended
Dec. 31, 2016
Land Improvements [Member]  
Property Plant And Equipment [Line Items]  
Property, plant and equipment, useful life 15 years
Minimum [Member] | Buildings and Improvements [Member]  
Property Plant And Equipment [Line Items]  
Property, plant and equipment, useful life 15 years
Minimum [Member] | Equipment [Member]  
Property Plant And Equipment [Line Items]  
Property, plant and equipment, useful life 3 years
Maximum [Member] | Buildings and Improvements [Member]  
Property Plant And Equipment [Line Items]  
Property, plant and equipment, useful life 40 years
Maximum [Member] | Equipment [Member]  
Property Plant And Equipment [Line Items]  
Property, plant and equipment, useful life 15 years