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Guarantor and Nonguarantor Financial Statements - Condensed Consolidating Balance Sheet (Parenthetical) (Detail)
Jun. 30, 2017
Dec. 31, 2016
5.00% Senior Notes [Member]    
Condensed Balance Sheet Statements, Captions [Line Items]    
Interest rate of long-term debt 5.00% 5.00%
4.875% Senior Notes [Member]    
Condensed Balance Sheet Statements, Captions [Line Items]    
Interest rate of long-term debt 4.875% 4.875%
5.25% Senior Notes [Member]    
Condensed Balance Sheet Statements, Captions [Line Items]    
Interest rate of long-term debt 5.25% 5.25%