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Computation of Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Numerator
Net income									$ 20,587	$ 29,286	$ 30,984
Determination of shares (in thousands)
Weighted-average common shares outstanding									5,361	5,324	5,259
Dilutive effect - share-based awards									106	47	99
Diluted weighted-average common shares outstanding									5,467	5,371	5,358
Earnings per common share attributable to PLPC shareholders
Basic	$ 0.59	$ 1.14	$ 1.19	$ 0.92	$ 0.99	$ 1.75	$ 1.24	$ 1.52	$ 3.84	$ 5.50	$ 5.89
Diluted	$ 0.58	$ 1.12	$ 1.17	$ 0.91	$ 0.98	$ 1.71	$ 1.21	$ 1.50	$ 3.77	$ 5.45	$ 5.78

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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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