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Summary of Significant Accounting Policies - Summary of Adjustments to Quarterly Data Resulting from Adoption of New Standard in Statements of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncement Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax benefit | $ (349,080) | $ (71,992) | $ 57,651 | $ 112,395 | $ (95,581) | $ (13,705) | $ (129,488) | $ (41,976) | $ (251,026) | $ (280,750) | $ (338,677)
Net loss | $ 221,185 | $ (127,700) | $ 69,550 | $ 170,111 | $ (160,709) | $ (41,971) | $ (224,936) | $ (93,772) | $ 333,146 | $ (521,388) | $ (713,685)
Basic earnings per share | $ 0.89 | $ (0.52) | $ 0.28 | $ 0.69 | $ (0.66) | $ (0.23) | $ (1.35) | $ (0.56) | $ 1.34 | $ (2.75) | $ (4.29)
Diluted earnings per share | $ 0.89 | $ (0.52) | $ 0.28 | $ 0.69 | $ (0.66) | $ (0.23) | $ (1.35) | $ (0.56) | $ 1.34 | $ (2.75) | $ (4.29)
Accounting Standards Update 2016-09 |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax benefit |  |  |  |  |  |  |  | $ (41,976) |  |  |
Net loss |  |  |  |  |  |  |  | $ (93,772) |  |  |
Basic earnings per share |  |  |  |  |  |  |  | $ (0.56) |  |  |
Diluted earnings per share |  |  |  |  |  |  |  | $ (0.56) |  |  |
Accounting Standards Update 2016-09 | As Reported |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax benefit |  |  |  |  |  |  |  | $ (44,038) |  |  |
Net loss |  |  |  |  |  |  |  | $ (91,710) |  |  |
Basic earnings per share |  |  |  |  |  |  |  | $ (0.55) |  |  |
Diluted earnings per share |  |  |  |  |  |  |  | $ (0.55) |  |  |

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