Summary of Share Option Activity (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011
Number of Common Shares
Beginning Balance	635,197
Granted	20,633
Exercised	1,217	1,765
Forfeited or expired	(20,700)
Ending Balance	633,913
Exercisable at end of period	578,850
Weighted Average Exercise Share Price
Beginning Balance	$ 31.42
Granted	$ 19.02
Exercised	$ 12.84
Forfeited or expired	$ 33.63
Ending Balance	$ 30.98
Exercisable at end of period	$ 32.21
Weighted average fair value of options granted during the year	$ 7.85	$ 7.76
Weighted Average Contractual Remaining Life(Years)
Balance at end of period	2 years 3 months 18 days
Exercisable at end of period	1 year 10 months 24 days
Aggregate Intrinsic Value
Beginning Balance	$ 406
Granted
Exercised	6
Forfeited or expired	6
Ending Balance	435
Exercisable at end of period	$ 403

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Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures and Expirations In Period Total Intrinsic Value

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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