Share Capital - Share Repurchase Program - Additional Information 1 (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Oct. 02, 2012	Sep. 26, 2012
Class of Stock [Line Items]
Total cumulative cost of shares repurchased	$ 13,479,000
Share Repurchase [Member]
Class of Stock [Line Items]
Number of issued and outstanding common shares authorized to be repurchased			3,438,683
Percentage of issued and outstanding common shares authorized to be repurchased				10.00%
Number of issued and outstanding common shares repurchased	1,691,479	1,747,204
Total average cost per share of the share repurchase	$ 7.97	$ 7.84
Total cumulative cost of shares repurchased	13,500,000	13,700,000
Additional paid-in capital	$ 2,000,000	$ 2,400,000