General - Schedule of Earnings Per Share (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Earnings from continuing operations	$ 8,996	$ 13,682	$ 23,475	$ 26,360
Less dividend equivalents attributable to RSUs outstanding	(89)	(120)	(232)	(232)
Earnings from continuing operations attributable to common shareholders	8,907	13,562	23,243	26,128
Earnings from discontinued operations	1,239	28,195	3,035	38,606
Less dividend equivalents attributable to RSUs outstanding	(12)	(248)	(39)	(339)
Earnings from discontinued operations attributable to common shareholders	1,227	27,947	2,996	38,267
Net earnings attributable to common shareholders used for basic and diluted earnings per share calculation	$ 10,134	$ 41,509	$ 26,239	$ 64,395
Basic	33,417	33,397	33,406	33,397
Stock options
Diluted	33,417	33,397	33,406	33,397
RSUs outstanding at the end of the period	333	296	333	296