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Summary of Share-Based Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock option awards	$ 792	$ 1,208
Common, deferred, restricted and restricted unit awards	293	407
Share-based compensation	1,085	1,615
Allocated Share-based Compensation Expense	1,099	1,687
Equity-classified awards:
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation	1,085	1,615
Liability-classified awards
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation	$ 14	$ 72

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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