Quarterly report pursuant to Section 13 or 15(d)

Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements - Additional Information (Detail)

v3.7.0.1
Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements - Additional Information (Detail)
 6 Months Ended
Jun. 30, 2017
Jul. 30, 2013
Supplemental Guarantor Financial Information [Line Items]    
Percentage of guaranteed subsidiaries by the parent companies 100.00%  
7.50% Senior Notes, due August 2020 [Member]    
Supplemental Guarantor Financial Information [Line Items]    
Percentage of notes guaranteed by restricted subsidiaries   7.50%