Short-term Investments - Additional Information (Detail) - US Treasury Securities and Certificates of Deposit - USD ($)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Investment [Line Items]
Held to maturity securities, amortized cost	$ 187,300,000	$ 193,300,000
Held to maturity securities, carrying value	187,300,000	193,300,000
Held to maturity securities, fair value	187,300,000	193,200,000
Other-than-temporary impairments related to these investments	$ 0	$ 0
Minimum
Investment [Line Items]
Held to maturity securities maturity range	3 months
Maximum
Investment [Line Items]
Held to maturity securities maturity range	1 year

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- Definition

The stated maturity date of held-to-maturity investments.

+ References

No definition available.

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- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

No definition available.

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Fair value of investments in debt securities classified as held-to-maturity.

+ References

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- Definition

The amount by which the fair value of an investment in debt securities categorized as Held-to-maturity is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

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