Treasury Stock and Share Based Awards - Additional Information (Detail) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Stockholders Equity Note [Line Items]
Intrinsic value of options exercised	$ 15,000
Average remaining contractual life of options outstanding	2 years
Tax benefit recognized on stock option exercised	6,000
Total fair value of vested shares	11,893
Tax benefit recognized on vested shares	3,618
Restricted Stock Units (RSUs)
Stockholders Equity Note [Line Items]
Market value of common stock on the date of grant	$ 29.44
Unrecognized Compensation expense	6,202,000
Weighted average period over which remaining compensation expense will be recognized (in years)	2 years
Number of hypothetical shares of common stock	115,107
Percentage of IRR, which is the threshold	8.50%
Percentage of IRR, which is the target	10.50%
Percentage of IRR, which is the maximum	12.50%
Percentage of restricted stock units vest	100.00%
Expected forfeiture rate	5.00%
Compensation expense	862,000	781,000
Restricted stock unit awards vested	279,697
Restricted stock unit conversion into share of common stock, conversion ratio	1
Dividends paid on vested restricted stock units	889,000
Total fair value of shares vested during the period	8,234,000
Recognized tax benefits related to shares vested during the period	3,458,000
Number of hypothetical shares of common stock	830,081
Restricted Stock
Stockholders Equity Note [Line Items]
Shares of Restricted Stock Granted	185,821
Market value of common stock on the date of grant	$ 29.44
Minimum forfeiture rate for restricted stock awards	0.00%
Maximum forfeiture rate for restricted stock awards	5.00%
Compensation expense	2,588,000	2,534,000
Unrecognized Compensation expense	$ 20,949,000
Weighted average period over which remaining compensation expense will be recognized (in years)	2 years
Restricted stock unit awards vested	408,140
Restricted Stock \| Certain of the restricted stock granted
Stockholders Equity Note [Line Items]
Award vesting period range for restricted stock granted to employees	3 years
Restricted Stock \| Remaining restricted stock granted
Stockholders Equity Note [Line Items]
Award vesting period range for restricted stock granted to employees	4 years
Restricted Stock \| Employee
Stockholders Equity Note [Line Items]
Shares of Restricted Stock Granted	185,821

Amount of compensation cost recognized during periods presented for outstanding restricted stock unit awards.

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Tax benefit realized on restricted stock that vested during the period.

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Maximum forfeiture rate used for restricted stock awards granted during the period.

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Percentage of IRR, which is the maximum.

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Number of hypothetical shares that could be issued if IRR level of at least 12.5% is reached for all grants for which restricted stock units are outstanding.

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Number Of Hypothetical Shares of Common Stock Outstanding at Maximum Internal Rate of Return Level

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Percentage of restricted stock units that vest upon target IRR level being reached.

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Value of restricted stock awards vested during the period.

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Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Forfeiture Rate

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Percentage of IRR, which is the target.

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Percentage of IRR, which is the threshold.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Aggregate unrecognized cost of share-based awards, other than options, made to employees under an equity-based compensation plan, that have yet to vest.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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