Equity and Earnings (Loss) per Share - Reclassification out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)	$ 3,527	$ 1,042	$ 4,599	$ 3,059	$ 3,267	$ (1,169)	$ 86	$ 81	$ 12,227	$ 2,265	$ (714)
Net income (loss) from continuing operations attributable to common shareholders									25,318	$ 22,843	$ (5,807)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss) from continuing operations attributable to common shareholders									550
Pension Plan Items [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Recognized net actuarial loss									25
Settlement loss									414
Total before tax									439
Income tax expense (benefit)									160
Net income (loss) from continuing operations attributable to common shareholders									599
Post Employment Benefit Items [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Recognized net actuarial loss									278
Amortization of prior service cost									(338)
Total before tax									(60)
Income tax expense (benefit)									(41)
Net income (loss) from continuing operations attributable to common shareholders									(101)
Equity Method Investment Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Foreign currency loss									88
Income tax expense (benefit)									(36)
Net income (loss) from continuing operations attributable to common shareholders									$ 52