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Net Income Per Share - Additional Information (Detail)	3 Months Ended		6 Months Ended
Net Income Per Share - Additional Information (Detail)	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Diluted computation increased	1,600,000	813,000	1,700,000	959,000
Share-based awards outstanding	4,300,000	3,900,000	4,300,000	3,900,000

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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