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Income Per Common Share - Computations of Basic and Diluted 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, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Net income | $ 28,171 | $ 19,178 | $ 143,983 | $ (75,610) | $ 52,962 | $ (53,836) | $ 55,676 | $ (41,800) | $ 115,722 |  | $ 13,002 |  | $ 58,026 |
Participating basic earnings |  |  |  |  |  |  |  |  | (1,975) | [1] | (460) | [1] | (1,037) | [1]
Basic income attributed to common shareholders |  |  |  |  |  |  |  |  | 113,747 |  | 12,542 |  | 56,989 |
Reallocation of participating earnings |  |  |  |  |  |  |  |  | 9 | [1] |  |  | 5 | [1]
Diluted income attributed to common shareholders |  |  |  |  |  |  |  |  | 113,756 |  | 12,542 |  | 56,994 |
Income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ 0.17 | $ 0.12 | $ 0.88 | $ (0.47) | $ 0.33 | $ (0.34) | $ 0.34 | $ (0.26) | $ 0.71 |  | $ 0.08 |  | $ 0.36 |
Diluted | $ 0.17 | $ 0.12 | $ 0.88 | $ (0.47) | $ 0.32 | $ (0.34) | $ 0.34 | $ (0.26) | $ 0.70 |  | $ 0.08 |  | $ 0.36 |
Continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 115,722 |  | 13,002 |  | 42,706 |
Participating basic earnings |  |  |  |  |  |  |  |  | (1,975) | [1] | (460) | [1] | (763) | [1]
Basic income attributed to common shareholders |  |  |  |  |  |  |  |  | 113,747 |  | 12,542 |  | 41,943 |
Reallocation of participating earnings |  |  |  |  |  |  |  |  | 9 | [1] |  |  | 3 | [1]
Diluted income attributed to common shareholders |  |  |  |  |  |  |  |  | 113,756 |  | 12,542 |  | 41,946 |
Income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  | $ 0.71 |  | $ 0.08 |  | $ 0.26 |
Diluted |  |  |  |  |  |  |  |  | $ 0.70 |  | $ 0.08 |  | $ 0.26 |
Discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  | 15,320 |
Participating basic earnings |  |  |  |  |  |  |  |  |  |  |  |  | (274) | [1]
Basic income attributed to common shareholders |  |  |  |  |  |  |  |  |  |  |  |  | 15,046 |
Reallocation of participating earnings |  |  |  |  |  |  |  |  |  |  |  |  | 2 | [1]
Diluted income attributed to common shareholders |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,048 |
Income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.10 |
Diluted |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.10 |
[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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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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