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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, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator
Net income	$ 2,488us-gaap_ProfitLoss	$ 2,555us-gaap_ProfitLoss	$ 5,080us-gaap_ProfitLoss	$ 2,738us-gaap_ProfitLoss	$ 3,132us-gaap_ProfitLoss	$ 6,104us-gaap_ProfitLoss	$ 6,386us-gaap_ProfitLoss	$ 4,965us-gaap_ProfitLoss	$ 12,861us-gaap_ProfitLoss	$ 20,587us-gaap_ProfitLoss	$ 29,286us-gaap_ProfitLoss
Determination of shares
Weighted-average common shares outstanding									5,377us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	5,361us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	5,324us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect - share-based awards									5us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	106us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	47us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted weighted-average common shares outstanding									5,382us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	5,467us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	5,371us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per common share attributable to PLPC shareholders
Basic	$ 0.46us-gaap_EarningsPerShareBasic	$ 0.48us-gaap_EarningsPerShareBasic	$ 0.94us-gaap_EarningsPerShareBasic	$ 0.51us-gaap_EarningsPerShareBasic	$ 0.59us-gaap_EarningsPerShareBasic	$ 1.14us-gaap_EarningsPerShareBasic	$ 1.19us-gaap_EarningsPerShareBasic	$ 0.92us-gaap_EarningsPerShareBasic	$ 2.39us-gaap_EarningsPerShareBasic	$ 3.84us-gaap_EarningsPerShareBasic	$ 5.50us-gaap_EarningsPerShareBasic
Diluted	$ 0.46us-gaap_EarningsPerShareDiluted	$ 0.48us-gaap_EarningsPerShareDiluted	$ 0.94us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted	$ 0.58us-gaap_EarningsPerShareDiluted	$ 1.12us-gaap_EarningsPerShareDiluted	$ 1.17us-gaap_EarningsPerShareDiluted	$ 0.91us-gaap_EarningsPerShareDiluted	$ 2.39us-gaap_EarningsPerShareDiluted	$ 3.77us-gaap_EarningsPerShareDiluted	$ 5.45us-gaap_EarningsPerShareDiluted

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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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