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New Accounting Standards - 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			6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016
New Accounting Pronouncement Early Adoption [Line Items]
Income tax benefit	$ 57,651	$ (129,488)		$ 170,046	$ (171,464)
Net income (loss)	$ 69,550	$ (224,936)		$ 239,661	$ (318,708)
Basic earnings per share	$ 0.28	$ (1.35)		$ 0.97	$ (1.91)
Diluted earnings per share	$ 0.28	$ (1.35)		$ 0.97	$ (1.91)
Accounting Standards Update 2016-09
New Accounting Pronouncement Early Adoption [Line Items]
Income tax benefit			$ (41,976)
Net income (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 income (loss)			$ (91,710)
Basic earnings per share			$ (0.55)
Diluted earnings per share			$ (0.55)

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