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Fair Value Measurement - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Restricted investments	$ 22.2	$ 21.9

X

- References

No definition available.

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- Definition

The aggregate value of all restricted investments.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 946



-SubTopic 320



-Section S99



-Paragraph 4



-Subparagraph (SX 210.12-12C.9(c))



-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 946



-SubTopic 320



-Section S99



-Paragraph 1



-Subparagraph (SX 210.12-12.6(c))



-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010

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