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Net Income Per Common Share - Computations of Basic and Diluted (Loss) Income Per Common Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Earnings Per Share Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income, as reported | $ 284,054 us-gaap_NetIncomeLoss | $ 146,418 us-gaap_NetIncomeLoss | $ 171,389 us-gaap_NetIncomeLoss | $ 32,521 us-gaap_NetIncomeLoss | $ 28,171 us-gaap_NetIncomeLoss | $ 19,178 us-gaap_NetIncomeLoss | $ 143,983 us-gaap_NetIncomeLoss | $ (75,610)us-gaap_NetIncomeLoss | $ 634,382 us-gaap_NetIncomeLoss |  | $ 115,722 us-gaap_NetIncomeLoss |  | $ 13,002 us-gaap_NetIncomeLoss |
Participating basic earnings |  |  |  |  |  |  |  |  | (10,725)us-gaap_UndistributedEarnings | [1] | (1,975)us-gaap_UndistributedEarnings | [1] | (460)us-gaap_UndistributedEarnings | [1]
Basic net income attributed to common shareholders |  |  |  |  |  |  |  |  | 623,657 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | 113,747 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | 12,542 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
Reallocation of participating earnings |  |  |  |  |  |  |  |  | 48 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | [1] | 9 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | [1] |  |
Diluted net income attributed to common shareholders |  |  |  |  |  |  |  |  | $ 623,705 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |  | $ 113,756 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |  | $ 12,542 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ 1.68 us-gaap_EarningsPerShareBasic | $ 0.87 us-gaap_EarningsPerShareBasic | $ 1.04 us-gaap_EarningsPerShareBasic | $ 0.20 us-gaap_EarningsPerShareBasic | $ 0.17 us-gaap_EarningsPerShareBasic | $ 0.12 us-gaap_EarningsPerShareBasic | $ 0.88 us-gaap_EarningsPerShareBasic | $ (0.47)us-gaap_EarningsPerShareBasic | $ 3.81 us-gaap_EarningsPerShareBasic |  | $ 0.71 us-gaap_EarningsPerShareBasic |  | $ 0.08 us-gaap_EarningsPerShareBasic |
Diluted | $ 1.68 us-gaap_EarningsPerShareDiluted | $ 0.86 us-gaap_EarningsPerShareDiluted | $ 1.04 us-gaap_EarningsPerShareDiluted | $ 0.20 us-gaap_EarningsPerShareDiluted | $ 0.17 us-gaap_EarningsPerShareDiluted | $ 0.12 us-gaap_EarningsPerShareDiluted | $ 0.88 us-gaap_EarningsPerShareDiluted | $ (0.47)us-gaap_EarningsPerShareDiluted | $ 3.79 us-gaap_EarningsPerShareDiluted |  | $ 0.70 us-gaap_EarningsPerShareDiluted |  | $ 0.08 us-gaap_EarningsPerShareDiluted |
[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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