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Basis of Presentation - Summary of Fair Value of Short-Term Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	$ 430,663	$ 286,795
Time Deposits and Certificates of Deposit [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	11,892	20,948
Bankers Acceptance Drafts [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	728	82
Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	124,997	75,674
Corporate Obligations [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	165,109	88,689
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	8,355	3,353
U.S. Agency Obligations [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	119,582	98,049
Short-Term Investments [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	430,663	286,795
Short-Term Investments [Member] | Time Deposits and Certificates of Deposit [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	11,892	20,948
Short-Term Investments [Member] | Bankers Acceptance Drafts [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	728	82
Short-Term Investments [Member] | Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	124,997	75,674
Short-Term Investments [Member] | Corporate Obligations [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	165,109	88,689
Short-Term Investments [Member] | Municipal Bonds [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	8,355	3,353
Short-Term Investments [Member] | U.S. Agency Obligations [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	$ 119,582	98,049
Short-Term Investments [Member] | As Previously Reported [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments		129,594
Short-Term Investments [Member] | As Previously Reported [Member] | Time Deposits and Certificates of Deposit [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments		20,900
Short-Term Investments [Member] | As Previously Reported [Member] | Bankers Acceptance Drafts [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments		82
Short-Term Investments [Member] | As Previously Reported [Member] | Corporate Obligations [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments		24,020
Short-Term Investments [Member] | As Previously Reported [Member] | Municipal Bonds [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments		2,099
Short-Term Investments [Member] | As Previously Reported [Member] | U.S. Agency Obligations [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments		82,493
Short-Term Investments [Member] | Adjustment [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments		157,201
Short-Term Investments [Member] | Adjustment [Member] | Time Deposits and Certificates of Deposit [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments		48
Short-Term Investments [Member] | Adjustment [Member] | Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments		75,674
Short-Term Investments [Member] | Adjustment [Member] | Corporate Obligations [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments		64,669
Short-Term Investments [Member] | Adjustment [Member] | Municipal Bonds [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments		1,254
Short-Term Investments [Member] | Adjustment [Member] | U.S. Agency Obligations [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments		$ 15,556

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

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