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Stock-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 18 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  | 9 Months Ended |
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Jun. 30, 2013 Restricted Shares | Sep. 30, 2013 Restricted Shares | Jun. 30, 2013 Restricted Shares | Sep. 30, 2013 Stock Options | Jun. 30, 2013 Stock Options | Mar. 31, 2013 Stock Options | Sep. 30, 2012 Stock Options | Sep. 30, 2013 Stock Options | Sep. 30, 2012 Stock Options | Dec. 31, 2012 Stock Options | Sep. 30, 2013 2009 Employee Option Plan | Sep. 30, 2013 2000 Employee Option Plan and 2009 Employee Option Plan | Sep. 30, 2013 2004 Directors Option Plan | Sep. 30, 2013 2012 Directors Restricted Stock Plan | Sep. 30, 2013 2000 Employee Option Plan
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional stock options that can be granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Shares available for the granting of additional stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,315,070 |  | 70,000 | 95,131 |
Options ratable vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 3 years |  |
Options exercisable period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years | 10 years |  |
Number of additional stock options expected to be granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Expense incurred for stock-based compensation plans (in dollars) | $ 9,413 | $ 8,066 | $ 26,584 | $ 23,167 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expense incurred for stock-based compensation plans, net of tax (in dollars) | 6,940 | 5,885 | 19,432 | 16,542 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding at the beginning of the period (in shares) |  |  |  |  |  |  |  | 14,198,590 | 12,344,775 | 13,446,719 |  | 13,446,719 |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  |  |  |  | 40,850 | 2,742,150 |  |  |  |  |  |  |  |  |  |
Options exercised (in shares) |  |  |  |  |  |  |  | (378,310) | (843,615) | (1,043,444) |  |  |  |  |  |  |  |  |
Options forfeited (in shares) |  |  |  |  |  |  |  | (26,980) | (44,720) | (58,500) |  |  |  |  |  |  |  |  |
Options outstanding at the end of the period (in shares) |  |  |  |  |  |  |  | 13,834,150 | 14,198,590 | 12,344,775 |  | 13,834,150 |  | 13,446,719 |  |  |  |  |
Vested and non-vested expected to vest at the end of the period (in shares) |  |  |  |  |  |  |  | 12,497,070 |  |  |  | 12,497,070 |  |  |  |  |  |  |
Exercisable at the end of the period (in shares) |  |  |  |  |  |  |  | 5,768,549 |  |  |  | 5,768,549 |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, options outstanding at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  | $ 51.23 | $ 44.37 | $ 43.39 |  | $ 43.39 |  |  |  |  |  |  |
Weighted average exercise price, options granted (in dollars per share) |  |  |  |  |  |  |  | $ 76.77 | $ 78.00 |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, options exercised (in dollars per share) |  |  |  |  |  |  |  | $ 39.63 | $ 38.03 | $ 31.30 |  |  |  |  |  |  |  |  |
Weighted average exercise price, options forfeited (in dollars per share) |  |  |  |  |  |  |  | $ 57.17 | $ 48.69 | $ 50.58 |  |  |  |  |  |  |  |  |
Weighted average exercise price, options outstanding at the end of the period (in dollars per share) |  |  |  |  |  |  |  | $ 51.61 | $ 51.23 | $ 44.37 |  | $ 51.61 |  | $ 43.39 |  |  |  |  |
Weighted average exercise price, vested and non-vested expected to vest (in dollars per share) |  |  |  |  |  |  |  | $ 51.02 |  |  |  | $ 51.02 |  |  |  |  |  |  |
Weighted average exercise price, exercisable (in dollars per share) |  |  |  |  |  |  |  | $ 41.28 |  |  |  | $ 41.28 |  |  |  |  |  |  |
Weighted Average Remaining Contractual Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual term of options outstanding |  |  |  |  |  |  |  | 7 years 3 months 14 days | 7 years 5 months 26 days | 7 years 22 days |  |  |  | 7 years 29 days |  |  |  |  |
Weighted average remaining contractual term of options vested and non-vested expected to vest |  |  |  |  |  |  |  | 7 years 2 months 12 days |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual term of options exercisable |  |  |  |  |  |  |  | 5 years 9 months 18 days |  |  |  |  |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of options outstanding (in dollars) |  |  |  |  |  |  |  | 358,182 | 379,390 | 373,596 |  | 358,182 |  | 268,596 |  |  |  |  |
Aggregate intrinsic value of options, vested and non-vested expected to vest (in dollars) |  |  |  |  |  |  |  | 330,899 |  |  |  | 330,899 |  |  |  |  |  |  |
Aggregate intrinsic value of options exercisable (in dollars) |  |  |  |  |  |  |  | 208,247 |  |  |  | 208,247 |  |  |  |  |  |  |
Status of the Company's non-vested options and changes during the year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested options at the beginning of the period (in shares) |  |  |  |  |  |  |  | 8,054,931 | 7,884,057 | 7,951,177 |  | 7,951,177 |  |  |  |  |  |  |
Non-vested options, options granted (in shares) |  |  |  |  |  |  |  | 40,850 | 2,742,150 |  |  |  |  |  |  |  |  |  |
Non-vested options, options vested (in shares) |  |  |  |  |  |  |  | (3,200) | (2,526,556) | (8,620) |  |  |  |  |  |  |  |  |
Non-vested options, options forfeited (in shares) |  |  |  |  |  |  |  | (26,980) | (44,720) | (58,500) |  |  |  |  |  |  |  |  |
Non-vested options at the end of the period (in shares) |  |  |  |  |  |  |  | 8,065,601 | 8,054,931 | 7,884,057 |  | 8,065,601 |  | 7,951,177 |  |  |  |  |
Weighted Average Fair Value at Grant Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average fair value at the grant date, options outstanding at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  | $ 14.75 | $ 13.35 | $ 13.36 |  | $ 13.36 |  |  |  |  |  |  |
Weighted average fair value at grant date, options granted (in dollars per share) |  |  |  |  |  |  |  | $ 17.97 | $ 17.41 |  |  |  |  |  |  |  |  |  |
Weighted average fair value at grant date, options vested (in dollars per share) |  |  |  |  |  |  |  | $ 14.97 | $ 13.32 | $ 15.62 |  |  |  |  |  |  |  |  |
Weighted average fair value at grant date, options forfeited (in dollars per share) |  |  |  |  |  |  |  | $ 14.24 | $ 13.40 | $ 13.50 |  |  |  |  |  |  |  |  |
Weighted average fair value at the grant date, options outstanding at the end of the period (in dollars per share) |  |  |  |  |  |  |  | $ 14.76 | $ 14.75 | $ 13.35 |  | $ 14.76 |  | $ 13.36 |  |  |  |  |
Total intrinsic value of stock options exercised (in dollars) |  |  |  |  |  |  |  | 16,456 |  |  | 36,383 | 91,091 | 77,320 |  |  |  |  |  |
Total fair value of stock options vested (in dollars) |  |  |  |  |  |  |  | 49 |  |  | 41 | 33,830 | 30,922 |  |  |  |  |  |
Total compensation cost related to non-vested options not yet recognized (in dollars) |  |  |  |  |  |  |  | 92,718 |  |  |  | 92,718 |  |  |  |  |  |  |
Weighted average expected amortization period |  |  |  |  |  | 7 months 24 days |  |  |  |  |  | 3 years 6 months 7 days |  |  |  |  |  |  |
Number of restricted shares issued |  |  |  |  | 12,824 |  | 17,045 |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value of restricted shares (in dollars per share) |  |  |  |  | $ 78.00 |  | $ 53.78 |  |  |  |  |  |  |  |  |  |  |  |
Total compensation cost related to non-vested restricted shares not yet recognized (in dollars) |  |  |  |  |  | $ 645 |  |  |  |  |  |  |  |  |  |  |  |  |

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