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Shareholders' equity - Summary of Stock Option Activity under Plan (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Options, Outstanding at beginning of the year	700,000
Stock Options, Granted	550,000	700,000
Stock Options, Exercised
Stock Options, Forfeited	(60,000)
Stock Options, Outstanding at end of the year	1,190,000	700,000
Stock Options, Exercisable at end of the year	160,000
Weighted Average Exercise Price, Outstanding at beginning of the year	$ 15.00
Weighted Average Exercise Price, Granted	$ 16.03	$ 15.00
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Forfeited	$ 15.00
Weighted Average Exercise Price, Outstanding at end of the year	$ 15.48	$ 15.00
Weighted Average Exercise Price, Exercisable at end of the year	$ 15.00

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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