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Reconciliation of Number of Common Shares Used in Calculating Basic and Diluted Net Earnings Per Share (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Basic average common shares outstanding									22,913,881	22,947,400	22,720,614
Incremental shares due to:
Restricted stock units									220,457	356,048	601,432
Performance shares									817,946	366,504	218,080
Diluted average common shares outstanding									23,952,284	23,669,952	23,540,126
Basic net earnings per common share	$ 0.51	$ 0.38	$ 0.60	$ 0.25	$ 1.65	$ 0.65	$ 0.90	$ 0.02	$ 1.73	$ 3.22	$ 8.03
Diluted net earnings per common share	$ 0.48	$ 0.37	$ 0.59	$ 0.24	$ 1.60	$ 0.64	$ 0.87	$ 0.02	$ 1.66	$ 3.12	$ 7.75
Anti-dilutive shares excluded from calculation									88,674		23,938

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