Earnings Per Share - Additional Information (Detail)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Computation Of Earnings Per Share Line Items      
Shares excluded from the computation of earnings per share 272 1,166 3,596
Contingently Returnable Shares Issued In Connection With Acquisitions Earnings Per Share, Basic
     
Computation Of Earnings Per Share Line Items      
Shares excluded from the computation of earnings per share 1,000 1,300 100