Summary Quarterly Financial Data - Summary of Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified
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3 Months Ended |
12 Months Ended |
Dec. 31, 2014
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Sep. 30, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Quarterly Financial Information Disclosure [Abstract] |
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Total revenues |
$ 264,537us-gaap_Revenues |
$ 495,834us-gaap_Revenues |
$ 405,151us-gaap_Revenues |
$ 212,290us-gaap_Revenues |
$ 271,959us-gaap_Revenues |
$ 538,389us-gaap_Revenues |
$ 411,292us-gaap_Revenues |
$ 238,610us-gaap_Revenues |
$ 1,377,812us-gaap_Revenues |
$ 1,460,250us-gaap_Revenues |
$ 1,423,752us-gaap_Revenues |
Operating (loss) income |
(22,497)us-gaap_OperatingIncomeLoss |
161,915us-gaap_OperatingIncomeLoss |
80,587us-gaap_OperatingIncomeLoss |
(59,408)us-gaap_OperatingIncomeLoss |
505us-gaap_OperatingIncomeLoss |
205,594us-gaap_OperatingIncomeLoss |
27,647us-gaap_OperatingIncomeLoss |
(35,873)us-gaap_OperatingIncomeLoss |
160,597us-gaap_OperatingIncomeLoss |
197,873us-gaap_OperatingIncomeLoss |
222,716us-gaap_OperatingIncomeLoss |
Net (loss) income |
$ (25,446)us-gaap_NetIncomeLoss |
$ 87,176us-gaap_NetIncomeLoss |
$ 37,406us-gaap_NetIncomeLoss |
$ (49,217)us-gaap_NetIncomeLoss |
$ (12,969)us-gaap_NetIncomeLoss |
$ 120,740us-gaap_NetIncomeLoss |
$ (15,900)us-gaap_NetIncomeLoss |
$ (39,951)us-gaap_NetIncomeLoss |
$ 49,919us-gaap_NetIncomeLoss |
$ 51,920us-gaap_NetIncomeLoss |
$ 74,221us-gaap_NetIncomeLoss |
(Loss) earnings per share: |
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Net (loss) income per share, basic |
$ (0.29)us-gaap_EarningsPerShareBasic |
$ 1.01us-gaap_EarningsPerShareBasic |
$ 0.43us-gaap_EarningsPerShareBasic |
$ (0.56)us-gaap_EarningsPerShareBasic |
$ (0.14)us-gaap_EarningsPerShareBasic |
$ 1.35us-gaap_EarningsPerShareBasic |
$ (0.18)us-gaap_EarningsPerShareBasic |
$ (0.48)us-gaap_EarningsPerShareBasic |
$ 0.57us-gaap_EarningsPerShareBasic |
$ 0.59us-gaap_EarningsPerShareBasic |
$ 0.90us-gaap_EarningsPerShareBasic |
Net (loss) income per share, diluted |
$ (0.29)us-gaap_EarningsPerShareDiluted |
$ 1.00us-gaap_EarningsPerShareDiluted |
$ 0.43us-gaap_EarningsPerShareDiluted |
$ (0.56)us-gaap_EarningsPerShareDiluted |
$ (0.14)us-gaap_EarningsPerShareDiluted |
$ 1.34us-gaap_EarningsPerShareDiluted |
$ (0.18)us-gaap_EarningsPerShareDiluted |
$ (0.48)us-gaap_EarningsPerShareDiluted |
$ 0.57us-gaap_EarningsPerShareDiluted |
$ 0.59us-gaap_EarningsPerShareDiluted |
$ 0.89us-gaap_EarningsPerShareDiluted |