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Summary of Nonvested Transaction Restricted Share Awards Issued under Stock Incentive Plan and Changes During Period (Detail) (S1 2003 Stock Incentive Plan, USD $)	3 Months Ended
	Mar. 31, 2013
S1 2003 Stock Incentive Plan
Nonvested Transaction Restricted Share Awards
Beginning Balance	50,244
Forfeited	(3,585)
Ending Balance	46,659
Weighted-Average Grant Date Fair Value
Beginning Balance	$ 35.41
Forfeited	$ 35.41
Ending Balance	$ 35.41

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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