Debt - Additional Information (Detail) (USD $)	3 Months Ended
	Sep. 30, 2012 Times Ratio	Jun. 30, 2012
Acquired Indefinite-lived Intangible Assets [Line Items]
Senior secured revolving credit facility	$ 125,000,000	$ 125,000,000
Credit agreement	5 years
Senior Leverage Ratio, Maximum	2.50%
Senior Leverage Ratio, Minimum	1.00%
Fixed Charge Coverage Ratio, Maximum	1.25
Fixed Charge Coverage Ratio, Minimum	1.00
Limit on asset dispositions	15,000,000
Additional Margin on alternate base rate loans, Minimum	0.75%
Additional Margin on alternate base rate loans, Maximum	1.50%
Additional Margin on LIBOR loans, Minimum	1.75%
Additional Margin on LIBOR loans, Maximum	2.50%
Sublimit on Canadian dollar borrowings	15,000,000
Additional Margin on CDOR loans, Minimum	1.75%
Additional Margin on CDOR loans, Maximum	2.50%
Additional Margin on Canadian prime rate loans, Minimum	2.25%
Additional Margin on Canadian prime rate loans, Maximum	3.00%
CDOR Rate description	Sum of the annual rate of interest which is the rate determined as being the arithmetic average of the quotations of all institutions listed in respect of the relevant CDOR interest period for Canadian Dollar denominated bankers' acceptances, plus 0.1%.
Canadian prime rate description	Greater of (i) the rate of interest per annum most recently announced or established by JPMorgan Chase Bank, N.A., Toronto Branch as its reference rate in effect on such day for determining interest rates for Canadian Dollar denominated commercial loans in Canada and (ii) the CDOR Rate plus 1.0%.
Maximum limit of consolidated funded indebtedness	2.5
Consolidated EBITDA as defined in the Credit Agreement	48,100,000
Consolidated funded indebtedness limit	120,200,000
Consolidated funded indebtedness	$ 4,500,000
Minimum [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Unused Credit Facility Fee	0.30%
Maximum [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Unused Credit Facility Fee	0.45%