Basis of Presentation and Significant Accounting Policies - Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accounting Policies [Abstract]
Weighted Average Number Diluted Shares Outstanding Adjustment		2,176,500	688,800	2,083,000	1,521,000
Loss (numerator):
Net loss - basic and diluted		$ (109,621)	$ (82,423)	$ (427,348)	$ (213,992)
Weighted average shares - basic		370,483,000	369,599,000	370,327,000	369,499,000
Non-vested restricted stock (1)	[1]	0	0	0	0
Weighted average shares - diluted		370,483,000	369,599,000	370,327,000	369,499,000
Net loss per share:
Basic (in dollars per share)		$ (0.30)	$ (0.22)	$ (1.15)	$ (0.58)
Diluted (in dollars per share)		$ (0.30)	$ (0.22)	$ (1.15)	$ (0.58)

[1] For the three and nine months ended September 30, 2016, the Company had a net loss and therefore the potential dilutive effect of approximately 2,176,500 and 2,083,000 weighted average non-vested restricted shares, respectively, were not included in the calculation of diluted net loss per share because to do so would have been anti-dilutive to the computations. The Company also had net losses for the three and nine months ended September 30, 2015, and therefore approximately 688,800 and 1,521,000 weighted average non-vested restricted shares, respectively, were not included in the calculation of diluted net loss per share for those periods.