Notes Payable - Additional Information (Detail) - USD ($) $ in Thousands, shares in Millions	1 Months Ended	9 Months Ended
	Mar. 31, 2014	May. 31, 2015
Debt Disclosure [Line Items]
Senior term debt	$ 125,000
Floating interest on borrowings above LIBOR rate	1.75%
Periodic Principal Payment	$ 1,750
Balloon payment	$ 160,000
Swap agreement interest rate	50.00%
Fixed interest rate	3.7375%
3.5% Convertible Senior Notes
Debt Disclosure [Line Items]
Debt instrument, interest rate		3.50%
Debt instrument, maturity date		Apr. 01, 2018
Senior term debt		$ 230,000
Original debt Conversion, Amount		$ 93,100
Conversion of debt in to common stock, shares		2.5
Debt instrument, carrying value of the principal balance		$ 136,900
Debt issuance costs removed from Intangibles and other assets, net and charged against additional paid in capital		$ 1,300
6-Year Senior Term Debt
Debt Disclosure [Line Items]
Senior term debt	$ 200,000
Senior term debt, maturity term	6 years