Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Effective tax rate	29.00%	30.80%
Federal tax rate	35.00%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	$ 1,200,000
Income Tax Expense (Benefit)	34,298,000	31,807,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 0