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Fair Value Measurements (Narrative) (Detail)
9 Months Ended
Sep. 30, 2017
Minimum [Member]  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated selling costs 5.00%
Maximum [Member]  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Estimated selling costs 10.00%