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Summary of Share-Based Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock option plans	$ 950	$ 1,379	$ 2,158	$ 2,787
Common, deferred, restricted and time-based restricted unit plans	386	634	793	1,022
Share-based compensation	1,336	2,013	2,951	3,809
Allocated Share-based Compensation Expense	1,889	2,013	3,576	3,809
Share Based Liability-classified awards
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation	$ 553	$ 0	$ 625	$ 0

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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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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