Summary of Stock Option Activity under 2007 Stock Incentive Plan (Detail) (Stock Incentive Plan 2007, USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011 Year
Stock Incentive Plan 2007
Shares
Outstanding at January 1, 2011:	2,921
Granted
Exercised
Forfeited	(324)
Outstanding at December 31, 2011:	2,597
Exercisable at December 31, 2011:	2,597
Vested or expected to vest At December 31, 2011	2,597
Weighted Average Exercise Price
Outstanding at January 1, 2011:	$ 15.76
Granted
Exercised
Forfeited	$ 25.39
Outstanding at December 31, 2011:	$ 14.56
Exercisable at December 31, 2011:	$ 14.56
Vested or expected to vest At December 31, 2011	$ 14.56
Weighted Average Remaining Life
Outstanding at January 1, 2011:	1.11
Outstanding at December 31, 2011:	0.78
Exercisable at December 31, 2011:	0.78
Vested or expected to vest At December 31, 2011	0.78
Aggregate Intrinsic Value
Outstanding at January 1, 2011:	$ 200
Outstanding at December 31, 2011:	206
Exercisable at December 31, 2011:	206
Vested or expected to vest At December 31, 2011	$ 206

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Share Based Compensation Arrangement By Share Based Payment Award Options Forfeited In Period Weighted Average Exercise Price

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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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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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.

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

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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 stock options awarded under the plan during the reporting period.

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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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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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As of the balance sheet date, the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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