Earnings Per Share - Calculation of Basic and Diluted Weighted Average Shares Outstanding and Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Basic:
Net loss	$ (195,761)	$ (152,906)	$ (384,545)	$ (480,294)
Net income attributable to participating securities	0	0	0	0
Net loss attributable to common stock - basic	(195,761)	(152,906)	(384,545)	(480,294)
Diluted:
Net loss	(195,761)	(152,906)	(384,545)	(480,294)
Net income attributable to participating securities	0	0	0	0
Net loss attributable to common stock - diluted	$ (195,761)	$ (152,906)	$ (384,545)	$ (480,294)
Weighted average shares (denominator):
Weighted average shares - basic (in shares)	5,585	5,525	5,578	5,521
Dilutive effect of stock options (in shares)	0	0	0	0
Dilutive effect of convertible notes (in shares)	0	0	0	0
Weighted average shares - diluted (in shares)	5,585	5,525	5,578	5,521
Basic loss per share (usd per share)	$ (35.05)	$ (27.68)	$ (68.94)	$ (86.99)
Diluted loss per share (usd per share)	$ (35.05)	$ (27.68)	$ (68.94)	$ (86.99)