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Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 998,896	$ 1,127,685	$ 1,016,410	$ 1,144,923
Balance	890,000	1,115,539	890,000	1,115,539
Pension Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	133	2,194	(236)	2,194
Gains/(losses) recognized in OCI	448	0	817	0
Balance	$ 581	$ 2,194	$ 581	$ 2,194

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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