Compensation Plans - Additional Information (Detail) (USD $)
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12 Months Ended | 0 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||||
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Dec. 31, 2013
plan
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2013
Minimum
New Employees [Member]
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Dec. 31, 2013
Maximum
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Dec. 31, 2013
Maximum
New Employees [Member]
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Dec. 31, 2013
Annual grants
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Dec. 31, 2013
Retention Grant [Member]
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May 15, 2012
Restricted Stock Units
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Dec. 31, 2013
Restricted Stock Units
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Dec. 31, 2012
Restricted Stock Units
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Dec. 31, 2013
Restricted Stock Units
Maximum
Award Earned Based on Shareholder Return Relative to Predetermined Peer Group
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Dec. 31, 2013
Restricted Stock Units
Maximum
Award Earned Based on Total Shareholder Return
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Dec. 31, 2013
Restricted Stock
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Dec. 31, 2012
Restricted Stock
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Dec. 31, 2011
Restricted Stock
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Dec. 31, 2013
Stock Options
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Dec. 31, 2013
Amended And Restated 2003 Annual And Long -Term Incentive Plan
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Dec. 31, 2013
Amended And Restated 2003 Annual And Long -Term Incentive Plan
Maximum
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Dec. 31, 2010
2010 Employment Inducement Award Plan
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||||||||
Number of stock-based compensation plans | 2 | |||||||||||||||||||
Equity award grants authorized | 7,000,000 | |||||||||||||||||||
Shares available for future issuance | 1,100,000 | |||||||||||||||||||
Award vesting period in years | 3 years | 5 years | 5 years | |||||||||||||||||
Annual grant expense period | 1 year | |||||||||||||||||||
Forfeitures recorded as a result of violating the post-termination restrictions | $ 1,000,000 | $ 1,300,000 | $ 3,300,000 | |||||||||||||||||
Restricted stock units, performance period | 36 months | |||||||||||||||||||
Weighted average period over which restricted stock expense expected to be recognized | 3 years | 2 years 10 months 10 days | ||||||||||||||||||
Award earning percentage | 50.00% | 50.00% | ||||||||||||||||||
Number of years risk free interest rate | 3 years | |||||||||||||||||||
Term of stock options | 10 years | |||||||||||||||||||
Restricted shares granted to ARI employees, value | 7,000,000 | |||||||||||||||||||
Restricted shares granted, share | 117,265 | 214,526 | 682,760 | 635,136 | 663,887 | 158,801 | ||||||||||||||
Compensation expense related to employee restricted stock awards | 21,000,000 | 20,200,000 | 21,200,000 | |||||||||||||||||
Tax benefit related to compensation costs for stock-based compensation arrangements | 8,200,000 | 7,900,000 | 8,200,000 | |||||||||||||||||
Fair value of restricted stock vested during the period | 46,400,000 | 44,800,000 | 67,700,000 | |||||||||||||||||
Unrecognized compensation cost related to restricted stock | $ 13,500,000 | $ 0 | ||||||||||||||||||
Expected Shares Payment For Tax Withholding For Share Based Compensation In Next Fiscal Year | 300,000 | |||||||||||||||||||
Acquisition related compensation awards vesting period | 3 years | 2 years | 5 years |