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Equity and EPS - Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance $ (500) $ (732) $ (4)
Other comprehensive income (loss) before reclassifications 99 (318) (1,417)
Amounts reclassified from accumulated other comprehensive income 28 550 689
Net other comprehensive income (loss) 127 232 (728)
Ending Balance (373) (500) (732)
Pension Plan Items [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance 0 (244) (377)
Other comprehensive income (loss) before reclassifications 0 (355) 218
Amounts reclassified from accumulated other comprehensive income 0 599 (85)
Net other comprehensive income (loss) 0 244 133
Ending Balance 0 0 (244)
Post Employment Benefit Items [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (510) (456) 390
Other comprehensive income (loss) before reclassifications 113 47 (1,620)
Amounts reclassified from accumulated other comprehensive income 21 (101) 774
Net other comprehensive income (loss) 134 (54) (846)
Ending Balance (376) (510) (456)
Equity Method Investment Translation Adjustment and Post-Employment Benefit Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance 10 (32) (17)
Other comprehensive income (loss) before reclassifications (14) (10) (15)
Amounts reclassified from accumulated other comprehensive income 7 52 0
Net other comprehensive income (loss) (7) 42 (15)
Ending Balance $ 3 $ 10 $ (32)