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Reclassification of Pension and Post-retirement Benefit Plan Out of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Accumulated Other Comprehensive (Loss)        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period $ 123,041 $ 75,662 $ (125,570) $ (77,080)
Amortization of prior service cost 17 (63) 34 (126)
Recognized net actuarial losses 4,083 4,574 8,012 6,860
Tax benefit (1,477) (1,629) (2,894) (2,434)
Total amount reclassified from Accumulated other comprehensive loss, net of tax 2,623 2,882 5,152 4,300
Balance at end of period (120,418) (72,780) (120,418) (72,780)
Balance at beginning of period (64,952) (2,005) (41,160) (1,189)
Foreign currency translation adjustments, parent 4,087 54 (19,705) (762)
Balance at end of period (60,865) (1,951) (60,865) (1,951)
Noncontrolling Interest        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period (2,457) (1,744) (2,199) (1,602)
Foreign currency translation adjustments, noncontrolling interest (196) 0 (454) (142)
Balance at end of period $ (2,653) $ (1,744) $ (2,653) $ (1,744)