Quarterly Financial Results - Schedule of Impact of Restatement Adjustments on Condensed Consolidated Statements of Operations (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ (22,197)	$ 251	$ (24,668)	$ (17,589)	$ 47,009	$ 47,210	$ 2,458	$ 13,361	$ (64,203)	$ 110,038	$ (11,301)
Adjustments [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)		(46,420)	(29,104)	(10,184)	(78,277)	(1,202)	(1,882)	(1,902)		(83,263)	(33,094)
Adjustments [Member] | Revenue Recognition [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)		(15,764)	(9,350)	(2,534)	(10,423)	3,502	(4,730)	2,914		(8,737)	(16,418)
Adjustments [Member] | Inventory Reserves [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)		(17,825)	(6,336)	(3,860)		(2,665)	2,352	(4,479)		(7,810)	(10,075)
Adjustments [Member] | Maintenance Costs [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)		(2,446)		(2,487)
Adjustments [Member] | Tax Matters [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)		(11,139)	(1,395)	(1,119)	(66,236)					(65,637)	(1,319)
Adjustments [Member] | Settlement Obligations [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)		1,412	(11,561)							879	(2,116)
Adjustments [Member] | Other Adjustments [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)		(658)	(462)	(184)	(1,618)	1,339	496	(337)		(867)	(694)
Adjustments [Member] | Understated Employee Benefits [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)						(3,378)				(1,091)	(2,472)
Adjustments [Member] | Aged Accounts Receivable [Member] | Maintenance Costs [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)		$ 1,100		$ 520