Borrowings - 2022 Notes - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended
	Dec. 22, 2015	Mar. 31, 2017	Mar. 31, 2016
Schedule Of Debt Instruments [Line Items]
Debt maturity date		Jul. 15, 2020
Interest expense		$ 1,979	$ 3,290
2022 Notes [Member]
Schedule Of Debt Instruments [Line Items]
Aggregate principal amount	$ 175,000
Net proceeds from the debt issuance	$ 168,500
Interest rate (as a percent)	11.50%
Semi-annual installments of principal	$ 21,900
Debt maturity date	Dec. 15, 2022
Interest expense		$ 5,200	$ 5,200