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Acquisitions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified		3 Months Ended				1 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 Carrier Enterprise I	Jul. 02, 2012 Carrier Enterprise I	Jul. 01, 2009 Carrier Enterprise I	Apr. 30, 2012 Carrier Enterprise III	Jul. 30, 2011 Carrier Enterprise II Location	Mar. 31, 2013 Carrier Enterprise II	Apr. 30, 2011 Carrier Enterprise II Location
Business Acquisition [Line Items]
Controlling interest	60.00%	60.00%	70.00%	60.00%	60.00%	60.00%	60.00%
Non-controlling interest, ownership percentage	40.00%			40.00%	40.00%	40.00%
Option to acquire interests, percentage		10.00%		10.00%
Percentage of additional ownership acquired			10.00%
Cash consideration			$ 51,881
Option to purchase additional interest, date		2014-07-01
Number of locations contributed to joint venture by non-controlling interest								28
Number of locations contributed to joint venture by controlling interest						14
Number of locations						7

X

- Definition

Amount of cash paid to acquire the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph f(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 18

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 20

-Subparagraph a (1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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- Definition

Number of Locations

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- Definition

Percentage Of Ownership Interests Acquired

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