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Subsequent Event - Additional Information (Detail) (USD $) | 6 Months Ended | 1 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Purchased customer accounts [Member] | Jun. 30, 2012 Purchased customer accounts [Member] | Jun. 30, 2013 Non-compete agreements [Member] | Jun. 30, 2012 Non-compete agreements [Member] | Jul. 01, 2013 Subsequent to January 1, 2009 [Member] | Jul. 01, 2013 Subsequent to January 1, 2009 [Member] Well Fargo Bank Revolver [Member] | Jul. 01, 2013 Subsequent to January 1, 2009 [Member] Bank of America Term Loan [Member] | Jul. 01, 2013 Subsequent to January 1, 2009 [Member] Minimum [Member] | Jul. 01, 2013 Subsequent to January 1, 2009 [Member] Maximum [Member] | Jul. 01, 2013 Subsequent to January 1, 2009 [Member] Beecher [Member] | Jul. 01, 2013 Subsequent to January 1, 2009 [Member] Beecher [Member] Well Fargo Bank Revolver [Member] | Jul. 01, 2013 Subsequent to January 1, 2009 [Member] Beecher [Member] Bank of America Term Loan [Member] | Jul. 01, 2013 Subsequent to January 1, 2009 [Member] Beecher [Member] Purchased customer accounts [Member] | Jul. 01, 2013 Subsequent to January 1, 2009 [Member] Beecher [Member] Non-compete agreements [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price of acquisitions | $ 17,865,000 | $ 599,122,000 |  |  |  |  |  |  |  |  |  | $ 454,475,000 |  |  |  |
Cash payments for acquisitions | 14,366,000 | 428,612,000 |  |  |  |  |  |  |  |  |  | 364,644,000 |  |  |  |
Assumption of liabilities |  | 133,938,000 |  |  |  |  |  |  |  |  |  | 89,831,000 |  |  |  |
Weighted average life (years) |  |  | 15 years | 15 years | 5 years | 5 years |  |  |  |  |  |  |  |  | 15 years | 5 years
Revolving and term loan |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 | 30,000,000 |  |
Line of credit facility drawn down amount |  |  |  |  |  |  |  |  |  |  |  |  | 30,000,000 |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  | Dec. 31, 2016 | Dec. 31, 2016 |  |  |  |  |  |  |
Increase in revolving credit facility |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |
Revolving credit facility in the maximum principal amount |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |
Letter of credit usage fee, minimum |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
Letter of credit usage fee, maximum |  |  |  |  |  |  |  | 1.40% |  |  |  |  |  |  |  |
LIBOR below base rate |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
Availability fees, minimum |  |  |  |  |  |  |  | 0.175% |  |  |  |  |  |  |  |
Availability fees, maximum |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |
Interest rate, minimum |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
Interest rate, maximum |  |  |  |  |  |  |  | 1.40% |  |  |  |  |  |  |  |
Adjusted LIBOR Rate |  |  |  |  |  |  | 1.50% |  |  | 1.00% | 1.40% |  |  |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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