Accounting for Uncertainty in Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Jun. 30, 2014
Deferred Taxes Classification [Line Items]
Unrecognized tax benefits that, if recognized, would affect the effective tax rate	$ 45.0	$ 46.8
Number of tax years the company is currently open to audit by tax authorities	7 years
Maximum
Deferred Taxes Classification [Line Items]
Liability for unrecognized tax benefits for interest and penalties	$ 2.0	$ 2.0

Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant