Interim Consolidated Financial Statements - Revised Consolidated Financial Statements (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net income	$ 3,043	$ 2,509	$ 7,266	$ 10,863
Prepaid expenses and other current assets			(255)	3,609
Net cash provided by operating activities			27,851	32,352
Income tax provision	2,009	1,739	4,981	6,982
Net income	3,043	2,509	7,266	10,863
Basic income per common share	$ 0.17	$ 0.12	$ 0.38	$ 0.51
Diluted income per common share	$ 0.16	$ 0.12	$ 0.38	$ 0.50
As Previously Reported [Member]
Cash flows from operating activities:
Net income		2,435		10,789
Prepaid expenses and other current assets				3,683
Net cash provided by operating activities				32,352
Income tax provision		1,813		7,056
Net income		2,435		10,789
Basic income per common share		$ 0.12		$ 0.51
Diluted income per common share		$ 0.12		$ 0.50
Adjustments [Member]
Cash flows from operating activities:
Net income		74		74
Prepaid expenses and other current assets				(74)
Income tax provision		(74)		(74)
Net income		$ 74		$ 74