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Related Party Transactions - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended | 1 Months Ended | 0 Months Ended
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May 31, 2011 | Dec. 31, 2013 Lease Property | Dec. 31, 2012 | Dec. 31, 2011 | Aug. 31, 2011 | Aug. 31, 2012 Trust [Member] | Aug. 31, 2012 Mckenna [Member] | Dec. 31, 2012 Haag [Member] | May 09, 2013 Ruhlman [Member] | Nov. 12, 2013 Robert G Ruhlman [Member] | Nov. 12, 2013 Dennis F Mckenna [Member] | Nov. 12, 2013 J Cecil Curlee [Member] | Nov. 12, 2013 Caroline S Vaccariello [Member] | Nov. 12, 2013 Ryan Ruhlman [Member] | May 08, 2013 Ryan Ruhlman [Member] | Nov. 12, 2013 David C Sunkle [Member] | May 08, 2013 David C Sunkle [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of common shares | 29,842 | 89,807 | 50,334 | 52,392 | 12,000 | 30,410 | 4,100 | 7,408 | 9,757 | 25,000 | 2,750 | 2,500 | 1,750 | 3,200 | 2,500 | 1,000 | 3,000
Common shares price per share | $ 69.21 |  |  |  | $ 63.72 | $ 54.92 | $ 55.91 | $ 54.71 | $ 76.87 | $ 78.91 | $ 78.91 | $ 78.91 | $ 78.91 | $ 78.91 | $ 76.98 | $ 78.91 | $ 76.98
Number of trading days to be considered for average price of stock repurchased | 30 days |  |  |  | 30 days | 30 days | 30 days | 30 days |  | 30 days | 30 days | 30 days | 30 days | 30 days | 30 days | 30 days | 30 days
Service expense |  | $ 0 | $ 700,000 | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation payment received |  |  |  | 184,608 |  |  |  |  |  |  |  |  |  |  |  |  |
Ryan Ruhlman employee years of service |  |  |  | 6 years |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation attributable to stock option |  |  |  | 99,600 |  |  |  |  |  |  |  |  |  |  |  |  |
Related party transactions number of property leased |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party transaction lease expenses |  | 300,000 | 300,000 | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Related party transactions number of property rented |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rent Expenses |  | 300,000 | 300,000 | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Labor expense |  | 300,000 | 700,000 | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage owned by related party |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maintenance and building expenses |  | $ 0 | $ 0 | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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