Commitments and Contingencies (Letters of Credit and Guarantees) - Additional Information (Detail) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Commitments And Contingencies [Line Items]
License bonds outstanding amount	$ 1,800,000	$ 1,900,000
Affiliated Entity [Member] \| Financial Standby Letter of Credit [Member]
Commitments And Contingencies [Line Items]
Letters of credit outstanding, guarantee obligation	1,900,000	1,900,000
Letters of Credit [Member]
Commitments And Contingencies [Line Items]
Letters of credit outstanding	$ 2,300,000	$ 2,300,000

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

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