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Common Stock - Additional Information (Detail) (USD $) | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Special Cash Dividend | Dec. 31, 2013 Stock Options | Dec. 31, 2012 Stock Options | Dec. 31, 2011 Stock Options | Dec. 31, 2013 Stock Options | Dec. 31, 2012 Stock Options | Dec. 31, 2011 Stock Options | Dec. 31, 2013 Restricted Stock | Dec. 31, 2012 Restricted Stock | Dec. 31, 2011 Restricted Stock | Dec. 31, 2013 2001 Employees' Restricted Stock Purchase Plan | Dec. 31, 2012 2001 Employees' Restricted Stock Purchase Plan | Dec. 31, 2011 2001 Employees' Restricted Stock Purchase Plan | Dec. 31, 2010 2001 Employees' Restricted Stock Purchase Plan | Dec. 31, 2011 2001 Employees' Restricted Stock Purchase Plan Chief Executive Officer Fourth quarter of 2007 Issuance | Dec. 31, 2010 2001 Employees' Restricted Stock Purchase Plan Chief Executive Officer Fourth quarter of 2007 Issuance | Dec. 31, 2009 2001 Employees' Restricted Stock Purchase Plan Chief Executive Officer Fourth quarter of 2007 Issuance | Dec. 31, 2008 2001 Employees' Restricted Stock Purchase Plan Chief Executive Officer Fourth quarter of 2007 Issuance | Dec. 31, 2007 2001 Employees' Restricted Stock Purchase Plan Chief Executive Officer Fourth quarter of 2007 Issuance | Dec. 31, 2013 2001 Employees' Restricted Stock Purchase Plan Chief Executive Officer First Quarter of 2009 Issuance | Dec. 31, 2012 2001 Employees' Restricted Stock Purchase Plan Chief Executive Officer First Quarter of 2009 Issuance | Dec. 31, 2011 2001 Employees' Restricted Stock Purchase Plan Chief Executive Officer First Quarter of 2009 Issuance | Dec. 31, 2010 2001 Employees' Restricted Stock Purchase Plan Chief Executive Officer First Quarter of 2009 Issuance | Dec. 31, 2009 2001 Employees' Restricted Stock Purchase Plan Chief Executive Officer First Quarter of 2009 Issuance | Mar. 31, 2009 2001 Employees' Restricted Stock Purchase Plan Chief Executive Officer First Quarter of 2009 Issuance | Dec. 31, 2012 2001 Employees' Restricted Stock Purchase Plan Chief Executive Officer First Quarter of 2008 Issuance | Dec. 31, 2011 2001 Employees' Restricted Stock Purchase Plan Chief Executive Officer First Quarter of 2008 Issuance | Dec. 31, 2010 2001 Employees' Restricted Stock Purchase Plan Chief Executive Officer First Quarter of 2008 Issuance | Dec. 31, 2009 2001 Employees' Restricted Stock Purchase Plan Chief Executive Officer First Quarter of 2008 Issuance | Mar. 31, 2008 2001 Employees' Restricted Stock Purchase Plan Chief Executive Officer First Quarter of 2008 Issuance | Dec. 31, 2012 2001 Employees' Restricted Stock Purchase Plan Various Employees | Dec. 31, 2011 2001 Employees' Restricted Stock Purchase Plan Various Employees | Dec. 31, 2007 2001 Employees' Restricted Stock Purchase Plan Various Employees | Dec. 31, 2013 2005 Employees' Restricted Stock Purchase Plan | Dec. 31, 2012 2005 Employees' Restricted Stock Purchase Plan | Dec. 31, 2011 2005 Employees' Restricted Stock Purchase Plan | Dec. 31, 2013 Long Term Incentive Plans | Dec. 31, 2012 Long Term Incentive Plans | Dec. 31, 2011 Long Term Incentive Plans | Dec. 31, 2013 Stock Incentive Plan | Dec. 31, 2012 Stock Incentive Plan | Dec. 31, 2011 Stock Incentive Plan | Dec. 31, 2013 Class B | Dec. 31, 2010 Class B 2001 Employees' Restricted Stock Purchase Plan | Dec. 31, 2013 Class B 2001 Employees' Restricted Stock Purchase Plan Chief Executive Officer ("CEO") And Chairman Of The Board | Dec. 31, 2012 Class B 2001 Employees' Restricted Stock Purchase Plan Chief Executive Officer ("CEO") And Chairman Of The Board | Dec. 31, 2011 Class B 2001 Employees' Restricted Stock Purchase Plan Chief Executive Officer ("CEO") And Chairman Of The Board | Dec. 31, 2010 Class B 2001 Employees' Restricted Stock Purchase Plan Chief Executive Officer ("CEO") And Chairman Of The Board | Mar. 31, 2010 Class B 2001 Employees' Restricted Stock Purchase Plan Chief Executive Officer ("CEO") And Chairman Of The Board | Dec. 31, 2013 Class B Stock Incentive Plan | Dec. 31, 2013 Class B 2010 Employees' Restricted Stock Purchase Plan | Dec. 31, 2013 Class B 2010 Employees' Restricted Stock Purchase Plan Chief Executive Officer ("CEO") And Chairman Of The Board | Dec. 31, 2012 Class B 2010 Employees' Restricted Stock Purchase Plan Chief Executive Officer ("CEO") And Chairman Of The Board | Dec. 31, 2012 Class B 2010 Employees' Restricted Stock Purchase Plan Chief Executive Officer ("CEO") And Chairman Of The Board First Anniversary | Dec. 31, 2012 Class B 2010 Employees' Restricted Stock Purchase Plan Chief Executive Officer ("CEO") And Chairman Of The Board Second Anniversary | Dec. 31, 2012 Class B 2010 Employees' Restricted Stock Purchase Plan Chief Executive Officer ("CEO") And Chairman Of The Board Third Anniversary | Dec. 31, 2013 Class B 2010 Employees' Restricted Stock Purchase Plan Various Employees | Dec. 31, 2012 Class B 2010 Employees' Restricted Stock Purchase Plan Various Employees | Dec. 31, 2011 Class B 2010 Employees' Restricted Stock Purchase Plan Various Employees | Dec. 31, 2013 Class B 2010 Employees' Restricted Stock Purchase Plan Various Employees Third Anniversary of Grant Date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared and paid, per share | $ 0.20 | $ 0.60 | $ 0.20 | $ 0.40 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared and paid | $ 19,600,000 | $ 58,400,000 | $ 19,500,000 | $ 38,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase programs authorized to purchase, shares | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess tax benefit from share based compensation | 20,121,000 | 16,040,000 | 7,568,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation cost recognized | 27,783,000 | 22,518,000 | 18,225,000 |  | 25,800,000 | 20,100,000 | 15,800,000 |  |  |  |  |  |  |  |  |  |  | 333,000 | 375,000 |  |  |  | 74,000 | 556,000 | 556,000 | 556,000 | 482,000 |  | 15,000 | 375,000 |  |  |  | 42,000 | 120,000 |  | 581,000 | 533,000 | 461,000 | 2,000,000 | 2,800,000 | 2,400,000 |  |  |  |  |  | 375,000 | 375,000 | 375,000 | 355,000 |  |  | 41,000 | 523,000 | 1,000,000 |  |  |  | 354,000 | 370,000 | 198,000 |
Compensation cost recognized, pre-tax charge |  |  |  |  |  |  |  | 25,800,000 | 20,100,000 | 15,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation cost recognized, after-tax |  |  |  |  |  |  |  | 16,100,000 | 12,500,000 | 9,800,000 | 853,000 | 1,400,000 | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation cost recognized |  |  |  |  |  |  |  |  |  |  | 1,400,000 | 2,300,000 | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares reserved |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 | 2,400,000 |  |  |  |  |  | 23,000,000 |  |  |  |  |  |  |  |  |  |
Stock options granted during period (net of cancellations) | 2,889,750 | 2,966,850 | 2,894,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,737,725 | 2,621,161 | 2,473,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value of option granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13.33 | $ 10.73 | $ 11.62 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total in-the-money value of all stock options exercised during the year | 70,900,000 | 54,400,000 | 28,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued under employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90,587 | 117,901 | 98,366 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of discount provided to eligible employees for purchase of shares under employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, net of cancellations | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of restricted shares approved, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 61,362 |  |  |  |  |  | 109,850 |  |  |  |  | 62,190 |  |  | 22,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49,472 |  | 10,000 |  | 54,127 |  |  |  |  |  | 21,500 |
Restricted shares price, per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 24.45 |  |  |  |  |  | $ 20.26 |  |  |  |  | $ 24.12 |  |  | $ 29.62 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30.32 |  | $ 80.36 |  | $ 36.95 |  |  |  |  |  | $ 53.21 |
Issuance of restricted shares, value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |  | 2,200,000 |  |  |  |  | 1,500,000 |  |  | 659,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  | 803,600 |  | 2,000,000 |  |  |  |  |  | 1,100,000 |
Estimated compensation cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000 |  |  |  |  |  | $ 760,000 | $ 500,000 |  |  |  |  | $ 183,000 |  |  |
Restricted Stock Purchase Plan, annual vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% | 25.00% | 25.00% |  |  |  |
Fully vested shares | 1,864,982 |  |  |  |  |  |  |  |  |  |  |  |  | 39,831 | 62,044 | 78,133 |  | 15,341 | 15,341 | 15,340 | 15,340 |  | 27,463 | 27,462 | 27,462 | 27,463 |  |  | 15,548 | 15,546 | 15,548 | 15,548 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,368 | 12,368 | 12,368 |  |  |  |  | 27,063 |  |  |  |  | 10,000 | 750 |  | 10,000
Number of shares cancelled |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 750 |  |
Stock-based compensation plans expired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2010-03 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance upon conversion of shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,657,523 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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