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Real Estate - Additional Information (Detail) ft² in Thousands	1 Months Ended	3 Months Ended
	Dec. 31, 2007 USD ($) Building	Mar. 31, 2017 USD ($) ft² RenewalOptions Lease_Agreements	Mar. 31, 2016 USD ($)	Dec. 31, 2008 USD ($)
Real Estate Properties [Line Items]
Sale of facility and associated real property	$ 109,000,000
Mortgage debt retired	47,700,000
Cash received net of transaction costs and debt retirement	$ 61,000,000
Leaseback transaction lease period	12 years
Number of building leased | Building	2
Net deferred gain on real estate sale		$ 10,000,000		$ 39,100,000
Deferred gain recognized on real estate sale		$ 900,000	$ 900,000
Lease expiration year		2019
Percentage of management fee included in the base annual rent		3.50%
Letter of credit		$ 4,600,000
Lease extension period		10 years
Number of times to renew the lease contract | RenewalOptions		2
Subleased area | ft²		16
Rental income from sublease agreement		$ 600,000
Increase in deferred rent		$ (114,000)	(64,000)
Sublease
Real Estate Properties [Line Items]
Number of sublease agreements | Lease_Agreements		1
Lease renewal additional periods		1 year
Reversal of cease use expense		$ 800,000
Increase in deferred rent		$ 200,000	$ 246,000
Second Sublease
Real Estate Properties [Line Items]
Lease renewal additional periods		1 year
Lease expiration date		2018-03

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Amount of expense (reversal of expense) in connection with exit or disposal activity (including executory costs such as maintenance charges) net of estimated income from potential subleasing.

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Number Of Buildings Leased

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Number Of Renewal Options

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Square footage subleased.

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Change during the period in carrying value for all deferred liabilities due within one year or operating cycle.

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The carrying amount of mortgage loans on real estate that were sold during the reporting period.

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The total amount of sublease rental income recognized during the period that reduces the entity's rent expense incurred under operating leases.

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The percentage charged for managing real estate properties.

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The portion of the gain that will be recorded as income or a reduction in rent expense in future periods less amounts recognized in the current period.

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