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Summary of Share-Based Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock option plans	$ 950	$ 1,354	$ 3,108	$ 4,141
Common, deferred, restricted and time-based restricted unit plans	332	466	1,125	1,488
Share-based compensation	1,282	1,820	4,233	5,629
Allocated Share-based Compensation Expense	1,447	1,820	5,023	5,629
Share Based Liability-classified awards
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation	$ 165	$ 0	$ 790	$ 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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