Accounts Receivable - Additional Information (Detail) (USD $)	9 Months Ended
Sep. 30, 2013	Dec. 31, 2012
Receivables [Abstract]
Allowance for doubtful accounts receivable, written off	$ 0
DoD receivables unbilled amount	$ 4,200,000	$ 3,200,000

Amount of direct write-downs of financing receivables charged against the allowance.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration