Acquisitions and Disposals - Proforma Consolidated Income Statement Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Business Acquisition Pro Forma Information [Abstract]
Net service revenue	$ 670,014	$ 686,010
Operating income	44,563	50,354
Net income	$ 21,031	$ 25,028
Basic and diluted earnings per share	$ 1.23	$ 1.40

Business Acquisition Pro Forma Earnings Per Share Basic And Diluted

No definition available.

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- Definition

The pro forma operating income (loss) for the period as if the business combination or combinations had been completed at the beginning of the period.

+ References

No definition available.

+ Details

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- Details

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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

+ Details

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