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Stock-based Compensation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Performance Unit Awards 2009 |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |
Performance period |  | The performance period for the 2009 Performance Units was the period from April 1, 2009 through March 31, 2012. |
Award description |  | Generally, the recipients would receive a target payment if the Company’s total shareholder return was positive and, when compared to the peer group, was at or above the 50th percentile but less than the 75th percentile and two times the target if at the 75th percentile or higher. The total target amount with respect to the 2009 Performance Units was approximately $3.4 million. If the Company’s total shareholder return was positive, and, when compared to the peer group, was at or above the 25th percentile but less than the 50th percentile, the recipients would only receive one-half of the target payment. |
Base payment |  | $ 1.7 |
Pro-rated obligation |  | 3.4 |
Compensation expense (benefit) | $ 1.0 | $ (1.9) | $ 2.2
Performance Unit Awards 2009 | Minimum |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |
Performance period |  | April 1, 2009 |
Performance Unit Awards 2009 | Maximum |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |
Performance period |  | March 31, 2012 |
Performance Unit Awards |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |
Performance period |  | The performance period for the Stock-Settled Performance Units is the three year period commending on April 1 of the year of grant, but can extend for an additional two years in certain circumstances. |
Performance Unit Awards 2010 |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |
Award description |  | Generally, the recipients will receive a target number of shares if the Company's total shareholder return is positive and, when compared to the peer group, is at the 50thpercentile and two times the target if at the 75thpercentile or higher.If the Company's total shareholder return is positive, and, when compared to the peer group, is at or above the 25thpercentile, but less than the 50thpercentile, the recipients will only receive one-half of the target number of shares. The grant of shares when achievement is between the 25thand 75thpercentile will be determined on a pro-rata basis. |

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable for incentive compensation awarded to employees and directors or earned by them based on the terms of one or more relevant arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 + Details
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- Definition General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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