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Accounting Policies - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Dec. 31, 2018	Mar. 15, 2018
Schedule Of Accounting Policies [Line Items]
Shares, non-dilutive	341,394	0	341,394	67,575
Reclassifications effect on net income				$ 0
Common stock, par value	$ 0		$ 0			$ 0	$ 0
Operating Lease, Liability	$ 3,130		$ 3,130
Operating Lease, Right-of-Use Asset					$ 3,400
Accounting Standards Update 2016-02 [Member]
Schedule Of Accounting Policies [Line Items]
Operating Lease, Liability					3,500
Operating Lease, Right-of-Use Asset					$ 3,500

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Schedule Of Accounting Policies [Line Items]

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Face amount per share of no-par value common stock.

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Amount of the effect of a change in accounting principle on net income.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of lessee's right to use underlying asset under operating lease.

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