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Income taxes - Current and Deferred Amounts of Provision for Income Taxes Expense (Benefit) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Current									$ 1,628	$ 2,705	$ 2,817
Deferred									(1,143)	353	217
Total	$ (1,277)	$ 392	$ 633	$ 737	$ 757	$ 761	$ 721	$ 819	$ 485	$ 3,058	$ 3,034

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.