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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		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Net income	$ 6,386	$ 6,596	$ 11,351	$ 14,729
Determination of shares
Weighted-average common shares outstanding	5,368	5,332	5,372	5,333
Dilutive effect-share-based awards	82	109	78	107
Diluted weighted-average common shares outstanding	5,450	5,441	5,450	5,440
Earnings per common share attributable to PLPC shareholders
Basic	$ 1.19	$ 1.24	$ 2.11	$ 2.76
Diluted	$ 1.17	$ 1.21	$ 2.08	$ 2.71

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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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