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Computation of Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Net income	$ 6,104	$ 9,284	$ 17,455	$ 24,013
Determination of shares
Weighted-average common shares outstanding	5,361	5,319	5,369	5,328
Dilutive effect-share-based awards	88	112	81	104
Diluted weighted-average common shares outstanding	5,449	5,431	5,450	5,432
Earnings per common share attributable to PLPC shareholders
Basic	$ 1.14	$ 1.75	$ 3.25	$ 4.51
Diluted	$ 1.12	$ 1.71	$ 3.20	$ 4.42

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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