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Reconciliation of unaudited quarterly financial data - Reconciliation of Unaudited Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax provision	$ (466)	$ 3,996	$ 2,203	$ 7,504
Net income	$ 9,109	7,148	$ 12,574	13,405
As Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax provision		2,713		5,992
Net income		$ 8,431		$ 14,917
Basic income per common share		$ 0.78		$ 1.40
Diluted income per common share		$ 0.68		$ 1.23
Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax provision		$ 1,283		$ 1,512
Net income		$ (1,283)		$ (1,512)
Basic income per common share		$ (0.12)		$ (0.14)
Diluted income per common share		$ (0.12)		$ (0.13)
Revised [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax provision		$ 3,996		$ 7,504
Net income		$ 7,148		$ 13,405
Basic income per common share		$ 0.66		$ 1.26
Diluted income per common share		$ 0.56		$ 1.10

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.