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Capital Stock - Non-vested Stock Option Activity and Related Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule Of Nonvested Stock Option Activity [Line Items]
Options Outstanding Non-Vested Stock Options-beginning of year	1,057	2,160	2,684
Options, Granted	433	96	733
Options, Vested	(747)	(1,071)	(1,084)
Options, Forfeited	(20)	(128)	(173)
Options Outstanding Non-Vested Stock Options-end of year	723	1,057	2,160
Weighted-Average Grant Date Fair Value, Outstanding non-vested stock options-beginning of Year	$ 6.40	$ 6.36	$ 6.56
Weighted-Average Grant Date Fair Value, Granted	$ 8.72	$ 11.27	$ 8.16
Weighted-Average Grant Date Fair Value, Vested	$ 5.44	$ 6.18	$ 7.48
Weighted Average Grant Date Fair Value, Forfeited	$ 8.24	$ 11.47	$ 10.06
Weighted-Average Grant Date Fair Value, outstanding non-vested stock options-end of year	$ 8.74	$ 6.40	$ 6.36

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Share-based compensation arrangement by share-based payment award equity instruments other than option forfeited in period weighted average grant date fair value.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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