Debt Convertible Senior Notes Textual -Additional Information (Detail)	1 Months Ended	3 Months Ended			9 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($) shares	Mar. 31, 2018 USD ($) d	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016	Dec. 31, 2014 USD ($)	Dec. 31, 2017 USD ($)	Oct. 06, 2017 USD ($) covenant	Sep. 30, 2017 $ / shares	Dec. 08, 2014 USD ($)
Debt Instrument [Line Items]
Initial applicable LIBOR loan rate									3.50%
Payments on revolving credit facility		$ 10,000,000	$ 0
Secured debt	$ 143,187,000	143,187,000						$ 245,000,000	$ 245,000,000
Debt Instrument, Convertible, If-converted Value in Excess of Principal		1,400,000
Interest expense, debt		2,000,000
Payments on Term Loan		101,813,000
Loss on extinguishment of debt		4,567,000	0
Applicable base loan rate								2.50%	1.50%
Additional borrowing capacity									$ 50,000,000
Percentage of excess cash flow									50.00%
Consolidated senior secured leverage ratio									1.25
Percentage net cash proceeds									100.00%
Percentage of net cash proceeds of sale leaseback transaction									30.00%
Number of financial covenants | covenant									2
Consolidated leverage ratio, period one									5.00
Consolidated leverage ratio, period two									4.25
Consolidated leverage ratio, period three									3.50
Consolidated fixed charge coverage ratio									1.25
Convertible Preferred Stock, Shares Issued upon Conversion | shares	2,427,547
Extinguishment of Convertible Senior Notes through issuance of common stock		118,075,000	0
Debt Instrument, Periodic Payment, Principal		$ 1,800,000
Convertible Debt [Member] | Senior 3 Point 25 Percent Convertible Notes Due 2020 [Member]
Debt Instrument [Line Items]
Convertible Senior Notes, face amount							$ 172,500,000.0
Senior Credit Facility, applicable margin										3.25%
Debt issuance cost							5,100,000
Deferred financing costs							$ (4,200,000)
Remaining amortization period of discount on the liability component		2 years 9 months				3 years	6 years
Adjustments to additional paid in capital		$ 900,000
Convertible Senior Notes, conversion ratio		31.1891
Convertible Senior Notes, conversion price (in usd per share) | $ / shares										$ 32.06
Convertible Senior Notes, threshold trading days | d		20
Convertible Senior Notes, threshold consecutive trading days | d		30
Convertible Senior Notes, threshold percentage of stock price trigger		130.00%
Convertible Senior Notes, threshold consecutive business days		5 days
Convertible Senior Notes, threshold consecutive trading days, following consecutive business days		5 days
Convertible Senior Notes, threshold percentage of stock price trigger, following consecutive business days		98.00%
Convertible Senior Notes, observation period		25 days
Interest expense, debt		$ 2,600,000	2,800,000		$ 8,200,000
Amortization of debt discount (premium)		1,300,000	1,400,000
Interest expense		$ 1,300,000	$ 1,400,000
Converted instrument, rate		100.00%
Interest rate										6.90%
Convertible Senior Notes, fair value disclosures							$ 141,900,000
Carrying value of equity component, net of issuance costs	$ 16,750,000	$ 16,750,000						$ 29,211,000			$ 30,700,000
Repurchase of convertible debt				$ 5,200,000
Loss on extinguishment of debt		1,600,000
Extinguishment of Convertible Senior Notes through issuance of common stock	70,200,000
Term Loan [Member]
Debt Instrument [Line Items]
Payments on Term Loan		100,000,000
Loss on extinguishment of debt		3,000,000
Other Current Assets [Member] | Convertible Debt [Member] | Senior 3 Point 25 Percent Convertible Notes Due 2020 [Member]
Debt Instrument [Line Items]
Deferred financing costs	$ (1,098,000)	$ (1,098,000)						$ (2,090,000)