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Share-Based Compensation - Equity-settled share-based payment plan (Detail) (T Bucks Employee Participation Plan [Member], USD $)	12 Months Ended
	Dec. 31, 2012	Jun. 30, 2013
T Bucks Employee Participation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options, beginning balance		548,234
Shares acquired by the Trust	548,234
Number of Shares, Ending Balance	548,234	548,234
Outstanding awards expected to vest	548,234
Beginning Balance		$ 25.79
Shares acquired by the Trust	$ 25.79
Fair Value, Ending Balance	$ 25.79	$ 25.79
Outstanding awards expected to vest	$ 25.79

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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