DEBT Narrative (Detail)		3 Months Ended
	Jul. 21, 2014 USD ($) $ / shares $ / unit shares	Mar. 31, 2016 USD ($) d $ / shares	Mar. 31, 2015 USD ($)	Aug. 15, 2014 USD ($)
Debt Instrument [Line Items]
Amortization of discount on convertible debt		$ 1,555,000	$ 1,268,000
Write-off of deferred financing costs		340,000	0
Convertible Senior 2019 Notes [Member] | Convertible Debt [Member]
Debt Instrument [Line Items]
Initial issued principal amount	$ 130,000,000			$ 19,500,000
Total principal amount	$ 149,500,000	$ 149,500,000
Interest rate per annum	2.50%
Threshold Trading Days (Whether or Not Consecutive) | d		20
Threshold Consecutive Trading Days		30 days
Threshold Percentage of Stock Price Trigger		130.00%
Principal Amount of Convertible Notes	$ 1,000
Maximum Percent of Conversion Rate for Each Trading Day	98.00%
Initial conversion rate | shares	67.41
Initial conversion price | $ / shares	$ 14.83	$ 14.83
Repurchase price percentage of principal		100.00%
Deferred Finance Costs, Gross	$ 4,600,000
Financing costs of equity component	1,100,000
Long-term Debt	122,100,000	$ 127,700,000
Debt discount	27,400,000	18,700,000
Unamortized deferred financing costs		3,100,000
Fair value of liability component of Notes		130,500,000
Interest expense recognized on debt agreement		2,500,000	2,400,000
Amortization of discount on convertible debt		1,300,000	1,300,000
Amortization of Financing Costs		200,000	$ 200,000
Payments for Hedging Activities	$ 18,400,000
Derivative, Cap Price | $ / unit	19.38
Issuance cost of convertible senior notes and revolving credit facility		5,700,000
The Revolver [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity, revolving credit facility	$ 42,500,000	20,000,000
Maturity date period, revolving credit facility	180 days
The Revolver [Member] | Revolving Credit Facility [Member] | Swing Line [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity, revolving credit facility	$ 10,000,000
The Revolver [Member] | Revolving Credit Facility [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity, revolving credit facility	$ 15,000,000
Interest Expense [Member] | The Revolver [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Unamortized deferred financing costs		$ 300,000