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Common Stock - Additional Information (Detail) (USD $) | 12 Months Ended |  |  |  |  | 0 Months Ended | 12 Months Ended |  |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Sep. 16, 2010 | Sep. 14, 2010 | Dec. 31, 2013 Westbury Agreement [Member] | Sep. 14, 2010 Westbury Agreement [Member] | Aug. 30, 2013 MMP [Member] | Aug. 30, 2013 MMP [Member] Westbury Agreement [Member] | Jul. 02, 2013 MMP [Member] Westbury Agreement [Member] | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2013 2006 Notes [Member] | Jun. 30, 2011 2006 Notes [Member] | Sep. 30, 2010 2006 Notes [Member]
Schedule Of Common Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized | 250,000,000 | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value | $ 0.01 | $ 0.01 |  |  |  | $ 7.25 | $ 6.25 |  |  |  |  |  |  |
Common stock voting rights | One vote for each share held on all matters submitted to a vote of stockholders. There are no cumulative voting rights with respect to the election of directors. |  |  |  |  |  |  |  |  |  |  |  |  |
Registration statement declaration date |  |  |  |  |  |  |  |  |  |  |  | Aug. 04, 2006 |  |
Convertible notes retired |  |  |  |  |  |  |  |  |  |  |  |  | $ 39,300,000 | $ 60,000,000
Remaining convertible notes |  |  |  |  |  |  |  |  |  |  |  | 750,000 |  |
Senior leverage ratio |  |  |  |  |  |  |  |  |  |  | 2.0 |  |  |
Stock repurchase program authorized to be repurchased | 0.0 | 1,000,000.0 | 1,000,000.0 | 4,578,894 | 7,716,669 |  | 7,700,000 |  | 3,850,000 |  |  |  |  |
Stock repurchase program cost | 397,548,000 | 371,080,000 |  | 25,100,000 | 48,500,000 |  |  |  |  |  |  |  |  |
Percentage of Holding |  |  |  |  |  |  |  | 50.00% | 50.00% |  |  |  |  |
Common stock, per share amount |  |  |  |  |  |  |  | $ 6.65 | $ 6.65 |  |  |  |  |
Payment for acquisition of treasury stock | $ 26,468,000 | $ 5,716,000 | $ 9,513,000 |  |  |  |  | $ 25,700,000 | $ 25,700,000 |  |  |  |  |
Number of days moving average share price calculation |  |  |  |  |  |  |  |  | 60 days | 60 days |  |  |  |

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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