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Capital Stock - Summary of Company's Restricted Shares Issued and Subject to Repurchase (Detail)	1 Months Ended	12 Months Ended
	Oct. 18, 2012	Dec. 31, 2012	Dec. 31, 2011
Share Based Payment Awards Non Vested Share Activity [Line Items]
Number of Restricted Stock Awards Outstanding, Beginning balance
Shares issued subject to vesting during the period	1,156,078	1,156,078
Unvested shares repurchased
Shares vested during the period
Number of Restricted Stock Awards Outstanding, Ending balance		1,156,078

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

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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