Components of Interest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2016		Jun. 30, 2015	Jun. 30, 2016		Jun. 30, 2015
Contractual Interest Expense [Line Items]
Contractual Interest Expense on Prepetition Liabilities Not Recognized in Statement of Operations	$ 23,500			$ 46,900
Debtor Reorganization Items, Write-off of Debt Issuance Costs and Debt Discounts				20,500
Interest on borrowings and related fees 1	11,344	[1]	$ 23,324	34,649	[1]	$ 46,132
Amortization of debt issuance costs 2	20,920	[2]	1,176	22,189	[2]	2,280
Capitalized interest	(43)		(1,477)	(183)		(3,376)
Interest expense	32,221		$ 23,023	56,655		$ 45,036
7.25% Senior Notes due 2019
Contractual Interest Expense [Line Items]
Contractual Interest Expense on Prepetition Liabilities Not Recognized in Statement of Operations	5,400			10,900
Senior Notes Due 2020 [Member]
Contractual Interest Expense [Line Items]
Contractual Interest Expense on Prepetition Liabilities Not Recognized in Statement of Operations	$ 16,500			$ 32,900

[1] Absent the bankruptcy proceedings and the corresponding suspension of the accrual of interest on unsecured debt, we would have recorded total contractual interest expense of $23.5 million and $46.9 million for the three and six months ended June 30, 2016, including $5.4 million and $10.9 million attributable to the 2019 Senior Notes and $16.5 million and $32.9 million attributable to the 2020 Senior Notes.

[2] Includes $20.5 million related to the accelerated write-off of unamortized debt issuance costs associated with the RBL and Senior Notes (see Note 8).