Annual report pursuant to Section 13 and 15(d)

Fair Value Summary of Long-Term Debt with Fixed Interest Rates (Detail)

v3.6.0.2
Fair Value Summary of Long-Term Debt with Fixed Interest Rates (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 25,000 $ 0
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt with fixed interest rates 0 166,303
Fair Value | Senior Notes Due 2019 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt with fixed interest rates 0 [1] 40,830
Fair Value | Senior Notes Due 2020 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt with fixed interest rates 0 [1] 125,473
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 0 1,075,000
Carrying Value | Senior Notes Due 2019 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 0 [1] 300,000
Carrying Value | Senior Notes Due 2020 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 0 $ 775,000
[1] 1 The Senior Notes were canceled upon our emergence from bankruptcy.