Long-Term Debt and Other Liabilities - Additional Information (Detail) $ / shares in Units, shares in Millions			1 Months Ended	12 Months Ended
	Mar. 03, 2015 USD ($) $ / shares shares	Nov. 02, 2010 USD ($)	Mar. 31, 2015 USD ($) shares	Dec. 31, 2015 USD ($) Trading_day shares	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Debt Instrument [Line Items]
Additional paid-in-capital				$ 861,243,000	$ 884,205,000
Proceeds received from the issuance of the convertible notes				361,940,000
Amortization of deferred financing costs				4,169,000	3,173,000	$ 2,832,000
Debt issuance costs					11,300,000
Forward stock repurchase transactions amount	$ 140,000,000			$ 140,000,000
Forward stock repurchase transaction, shares | shares	7.2			7.2
Forward stock repurchase transaction, settlement date	Mar. 01, 2020
Total debt				$ 576,031,000	310,252,000
Non lender fees					1,088,000	2,982,000
Letters of Credit [Member]
Debt Instrument [Line Items]
Credit facility/letters of credit amount outstanding				7,500,000	7,900,000
3.75% Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount of Convertible Notes	$ 361,900,000			361,900,000
Interest rate	3.75%
Option granted to initial purchasers	$ 60,000,000
Maturity date	Mar. 01, 2020
Additional paid-in-capital	$ 100,000,000
Convertible Notes, carrying amount of liability component	261,900,000			$ 274,528,000
Effective interest rate on convertible notes				11.50%
Proceeds received from the issuance of the convertible notes	$ 361,900,000
Convertible Notes, unamortized discount				$ 87,400,000
Amortization of deferred financing costs				1,000,000
Debt issuance costs				$ 6,500,000
Conversion rate	41.9274
Principal amount	$ 1,000
Conversion price | $ / shares	$ 23.85
Multiples of principal amount	$ 1,000
Debt instrument redemption price, percentage	100.00%
Forward stock repurchase transactions amount			$ 140,000,000
Forward stock repurchase transaction, shares | shares			7.2
Forward stock repurchase transaction, settlement date			Mar. 01, 2020
3.75% Convertible Senior Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Common stock price trading days | Trading_day				5
Common stock price consecutive trading days				5 days
Debt instrument redemption price, percentage				98.00%
3.75% Convertible Senior Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Percentage of common share price over conversion price for conversion				130.00%
Common stock price trading days | Trading_day				20
Common stock price consecutive trading days				30 days
3.75% Convertible Senior Notes [Member] | Issuance Costs [Member]
Debt Instrument [Line Items]
Additional paid-in-capital	$ 2,900,000
Loan origination fees	10,400,000
Issuance cost recorded to deferred financing costs	7,500,000
3.75% Convertible Senior Notes [Member] | Institutional Buyers [Member]
Debt Instrument [Line Items]
Principal amount of Convertible Notes	340,000,000
Principal amount of Convertible Notes, subsequently exercised	$ 21,900,000
Amended and Restated Senior Term Facility [Member]
Debt Instrument [Line Items]
Maturity date				Mar. 21, 2018
Loan origination fees				$ 22,200,000
Amortization of deferred financing costs				3,100,000	3,200,000	$ 2,800,000
Debt issuance costs				8,200,000	11,300,000
Total debt				$ 301,503,000	309,244,000
Percentage owned of capital stock of direct foreign subsidiary				65.00%
Minimum cash balance				$ 5,000,000
Net asset of borrowers not available for distribution				86,000,000
Principal payment				1,700,000
Non lender fees				$ 4,100,000
Percentage used for mandatory prepayment				50.00%
Percentage of prepayment				25.00%
Mandatory prepayment				$ 12,200,000
Voluntary prepayment percentage, up to December 21, 2015				3.00%
Voluntary prepayment percentage, after December 21, 2015 but prior to December 21, 2016				3.00%
Amended and Restated Senior Term Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio				3.25
Leverage ratio				2.0
Amended and Restated Senior Term Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Leverage ratio				3.25
Leverage ratio				2.0
Amended and Restated Senior Term Facility [Member] | Tranche B-1 Loans [Member]
Debt Instrument [Line Items]
Interest rate				11.25%
Amount of credit facility agreement				$ 248,000,000
Base rate floor				2.50%
Amended and Restated Senior Term Facility [Member] | Tranche B-1 Loans [Member] | Interest Rate [Member]
Debt Instrument [Line Items]
Libor rate loan margin				9.75%
Base rate loan margin				8.75%
Amended and Restated Senior Term Facility [Member] | Tranche B-1 Loans [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Statutory rate floor				1.50%
Amended and Restated Senior Term Facility [Member] | Tranche B-2 Loans [Member]
Debt Instrument [Line Items]
Interest rate				7.50%
Amount of credit facility agreement				$ 75,000,000
Base rate floor				2.00%
Amended and Restated Senior Term Facility [Member] | Tranche B-2 Loans [Member] | Interest Rate [Member]
Debt Instrument [Line Items]
Libor rate loan margin				6.50%
Base rate loan margin				5.50%
Amended and Restated Senior Term Facility [Member] | Tranche B-2 Loans [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Statutory rate floor				1.00%
Alaska Facility [Member]
Debt Instrument [Line Items]
Interest rate		10.00%
Amount of credit facility agreement		$ 4,100,000
Total debt					$ 1,008,000
Credit facility, termination date				2015-04
Payment period for principal amounts outstanding		6 years