Available-for-Sale Securities - Maturities of Debt Securities at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013
Amortized Cost And Fair Value Debt Securities [Abstract]
Mature within one year	$ 1,049
Mature in one to five years	7,652
Mature in over five years	994
Fair Value	$ 9,695

Amount of debt securities categorized neither as held-to-maturity nor trading.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

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

-Publisher FASB

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-Publisher FASB

-Name Accounting Standards Codification

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Balance Type:	debit
Period Type:	instant