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Earnings Per Share - Securities Excluded from Computation of Diluted Earning Per Share (Detail) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stock options [Member]
Employee and director:
Securities excluded from computation of diluted earning per share	18	18	18	18
Stock appreciation rights [Member]
Employee and director:
Securities excluded from computation of diluted earning per share	982	874	885	900

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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