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Basic and Diluted Earnings Per Share (Detail)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]                      
Shares used in the calculation of Basic earnings per share 13,324,942 13,287,463 13,262,023 13,162,824 13,122,004 12,817,910 12,725,216 12,688,819 13,260,739 13,064,051 12,624,495
Effect of dilutive securities:                      
Stock options, SAR's, RSA's, and shares held in escrow                 1,083,838 683,762 1,022,038
Diluted shares used in the calculation of earnings per share 14,299,211 14,459,154 14,443,794 14,089,946 13,804,806 13,765,533 13,739,836 13,744,710 14,344,577 13,747,813 13,646,533