Quarterly report pursuant to Section 13 or 15(d)

Reconciliation of Weighted Average Number of Common Shares Outstanding to those Used to Compute (Detail)

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Reconciliation of Weighted Average Number of Common Shares Outstanding to those Used to Compute (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Basic and Diluted Earnings Per Share          
Outstanding shares 96,809,622 94,537,936 96,809,622 94,537,936 95,398,961
Effect of weighting changes in outstanding shares (203,963) (3,191,347) (499,932) (5,301,660)  
Unvested restricted stock (1,941,000) (1,686,500) (1,941,000) (1,686,500)  
Adjusted shares 94,664,659 89,660,089 94,368,690 87,549,776