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Accumulated Other Comprehensive Loss - Summary of Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance | $ 378,156 |
Balance | 373,694 |
Minimum Pension Liability [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance | (20,149) | $ (22,268)
Amounts reclassified from accumulated other comprehensive loss | (9) | 45
Income tax benefit | 5 |
Net other comprehensive income (loss) | (4) | 45
Balance | (20,153) | (22,223)
Other-Than-Temporary Impairment of Investment [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance | (6,543) |
Amounts reclassified from accumulated other comprehensive loss | 166 |
Net other comprehensive income (loss) | 166 |
Balance | (6,377) |
Accumulated Other Comprehensive Loss [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance | (26,692) | (22,268)
Amounts reclassified from accumulated other comprehensive loss | 157 | 45
Income tax benefit | 5 |
Net other comprehensive income (loss) | 162 | 45
Balance | $ (26,530) | $ (22,223)

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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683 + Details
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