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Net (Loss) Income Per Common Share - Computations of Basic and Diluted (Loss) Income Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Earnings Per Share Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income, as reported |  | $ (321,827) | $ (300,948) | $ (118,594) | $ 27,684 | $ 284,054 | $ 146,418 | $ 171,389 | $ 32,521 | $ (713,685) | $ 634,382 | $ 115,722
Participating basic earnings | [1] |  |  |  |  |  |  |  |  | (450) | (10,725) | (1,975)
Basic net (loss) income attributed to common stockholders |  |  |  |  |  |  |  |  |  | (714,135) | 623,657 | 113,747
Reallocation of participating earnings | [1] |  |  |  |  |  |  |  |  | 0 | 48 | 9
Diluted net (loss) income attributed to common stockholders |  |  |  |  |  |  |  |  |  | $ (714,135) | $ 623,705 | $ 113,756
Net (loss) income per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ (1.93) | $ (1.81) | $ (0.71) | $ 0.16 | $ 1.68 | $ 0.87 | $ 1.04 | $ 0.20 | $ (4.29) | $ 3.81 | $ 0.71
Diluted |  | $ (1.93) | $ (1.81) | $ (0.71) | $ 0.16 | $ 1.68 | $ 0.86 | $ 1.04 | $ 0.20 | $ (4.29) | $ 3.79 | $ 0.70
[1] | Restricted stock Liability Awards represent participating securities because they participate in nonforfeitable dividends or distributions with common equity owners. Income allocable to participating securities represents the distributed and undistributed earnings attributable to the participating securities. Participating securities, however, do not participate in undistributed net losses.

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- Definition Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of stock options or restrictive stock units (RSUs). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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