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Fair Value Measurement - Summary of Marketable Securities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	$ 301,170	$ 244,326
Gross Unrealized Gains (Losses)	(52)	(35)
Recorded Basis	301,118	244,291
Marketable Securities Current [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	107,335	50,886
Gross Unrealized Gains (Losses)	0	(43)
Recorded Basis	107,335	50,843
Marketable Securities Current [Member] | Cash and Cash Equivalents [Member] | Money Market Funds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	21,312	17,110
Gross Unrealized Gains (Losses)	0	0
Recorded Basis	21,312	17,110
Marketable Securities Current [Member] | Available-for-sale Securities [Member] | Certificate of Deposit [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	0	8,330
Gross Unrealized Gains (Losses)	0	(43)
Recorded Basis	0	8,287
Marketable Securities Current [Member] | Available-for-sale Securities [Member] | Variable Rate Demand Notes (VRDN) [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	0	21,670
Gross Unrealized Gains (Losses)	0	0
Recorded Basis	0	21,670
Marketable Securities Current [Member] | Available For Sale Restricted [Member] | Money Market Funds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	76,023	3,776
Gross Unrealized Gains (Losses)	0	0
Recorded Basis	76,023	3,776
Marketable Securities Current [Member] | Available For Sale Restricted [Member] | Certificate of Deposit [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	10,000	0
Gross Unrealized Gains (Losses)	0	0
Recorded Basis	10,000	0
Marketable Securities Noncurrent [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	193,835	193,440
Gross Unrealized Gains (Losses)	(52)	8
Recorded Basis	193,783	193,448
Marketable Securities Noncurrent [Member] | Available-for-sale Securities [Member] | Money Market Funds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	4	14,944
Gross Unrealized Gains (Losses)	0	(14)
Recorded Basis	4	14,930
Marketable Securities Noncurrent [Member] | Available-for-sale Securities [Member] | Municipal Bonds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	3,135	3,843
Gross Unrealized Gains (Losses)	(3)	7
Recorded Basis	3,132	3,850
Marketable Securities Noncurrent [Member] | Available-for-sale Securities [Member] | Corporate Bonds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	2,970	2,153
Gross Unrealized Gains (Losses)	(24)	(3)
Recorded Basis	2,946	2,150
Marketable Securities Noncurrent [Member] | Available For Sale Restricted [Member] | Money Market Funds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	175,869	46,426
Gross Unrealized Gains (Losses)	0	0
Recorded Basis	175,869	46,426
Marketable Securities Noncurrent [Member] | Available For Sale Restricted [Member] | Certificate of Deposit [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	496	115,745
Gross Unrealized Gains (Losses)	(1)	0
Recorded Basis	495	115,745
Marketable Securities Noncurrent [Member] | Available For Sale Restricted [Member] | Municipal Bonds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	3,613	4,352
Gross Unrealized Gains (Losses)	(1)	21
Recorded Basis	3,612	4,373
Marketable Securities Noncurrent [Member] | Available For Sale Restricted [Member] | Corporate Bonds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	2,996	2,130
Gross Unrealized Gains (Losses)	(24)	(3)
Recorded Basis	2,972	2,127
Marketable Securities Noncurrent [Member] | Available For Sale Restricted [Member] | U.S. Treasuries [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	4,752	3,847
Gross Unrealized Gains (Losses)	1	0
Recorded Basis	$ 4,753	$ 3,847

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (d)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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