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Indebtedness - Additional Information (Detail)		1 Months Ended		12 Months Ended
Indebtedness - Additional Information (Detail)	Nov. 14, 2017 USD ($) shares $ / shares	Sep. 30, 2018 USD ($)	Jul. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) Loan	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Debt instrument, face amount				$ 570,000,000
Proceeds for issuance of notes allocated to equity					$ 570,000,000
Amount paid for capped calls transactions					50,901,000
Debt extinguishment loss				(2,322,000)
Revolving line-of-credit outstanding balance				420,554,000	431,051,000
Total indebtedness of unpaid principal balance					$ 1,300,000
Sale of Airport Facility date					2018-01
Long-term debt				420,554,000	$ 424,876,000
Mortgage Loan One [Member]
Debt Instrument [Line Items]
Revolving line-of-credit outstanding balance					800,000
Mortgage Loan Two [Member]
Debt Instrument [Line Items]
Revolving line-of-credit outstanding balance					500,000
Convertible Debt, The Term Loan, The Revolver and The Mortgage Loans [Member]
Debt Instrument [Line Items]
Long-term debt				420,600,000
Interest expense related to debt facilities				33,700,000	5,800,000	$ 1,900,000
2024 Convertible Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 570,000,000			$ 570,000,000	$ 570,000,000
Debt instrument, maturity date	Nov. 15, 2024
Debt instrument, interest rate per annum	1.50%
Debt instrument, payment frequency				The 2024 Notes were issued at face value and bear interest at the rate of 1.50% per annum, payable semi-annually in cash on each May 15 and November 15, commencing on May 15, 2018.
Debt instrument, conversion rate	0.013621
Debt instrument, conversion price \| $ / shares	$ 73.42			$ 73.42
Proceeds for issuance of notes allocated to equity	$ 161,100,000
Offering costs	4,200,000
Debt issuance costs	$ 10,600,000
Effective interest rate percentage				6.90%	6.90%
Capped calls strike price \| $ / shares	73.42
Capped calls cap price \| $ / shares	104.88
Amount paid for capped calls transactions	$ 50,900,000
2024 Convertible Notes [Member] \| Fundamental Change [Member]
Debt Instrument [Line Items]
Debt instrument, repurchase price percentage	100.00%
2024 Convertible Notes [Member] \| Minimum [Member] \| Beneficial Owner [Member] \| Fundamental Change [Member]
Debt Instrument [Line Items]
Voting percentage	50.00%
2024 Convertible Notes [Member] \| Common Stock [Member]
Debt Instrument [Line Items]
Debt instrument, convertible into shares \| shares	7,763,552
MidCap Financial Amended and Restated Credit and Security Agreement [Member] \| July 2017 Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate per annum			6.25%
Current borrowing capacity			$ 60,000,000
Variable interest rate description			one-month London Interbank Offered Rate
Origination fee, percentage			0.50%
Final payment fee, percentage			2.00%
Monthly principal payments commencement date			Jul. 01, 2018
Periodic principal payment frequency			monthly
Monthly principal payments			$ 800,000
Credit facility maturity date			2021-07
Midcap Financial Revolving Credit and Security Agreement [Member] \| Revolving Loan [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate per annum			3.95%
Current borrowing capacity			$ 40,000,000
Variable interest rate description				one-month LIBOR
Origination fee, percentage			0.50%
Credit facility maturity date			2021-07
Line of credit facility additional tranche that may be increased			$ 20,000,000
Origination fee			$ 200,000
MidCap Financial Amended and Restated Credit and Security Agreement and Revolving Credit and Security Agreement [Member]
Debt Instrument [Line Items]
Agreement termination date				2018-09
MidCap Financial Amended and Restated Credit and Security Agreement and Revolving Credit and Security Agreement [Member] \| July 2017 Term Loan [Member]
Debt Instrument [Line Items]
Debt extinguishment loss		$ (2,300,000)
Mortgage Loans [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate per annum					4.75%
Credit facility maturity date					2027-02
Number of mortgage loans outstanding \| Loan					2