Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Increase (decrease) in valuation of allowance	$ (47,917)	$ (12,418)	$ (974)
Unrealized excess tax benefits from stock options exercised	14,821	1,845
Unrecognized tax benefit	393	393	0
Significant change in uncertain tax benefit reasonably possible amount of unrecorded benefit	0
Accrued interest or penalties	0
U.S. Federal
Income Taxes [Line Items]
Net operating loss carryforwards (restated)	199,408
Net operating loss carryforwards expiration date description	expire in the years 2024 through 2033
U.S. Federal | Minimum
Income Taxes [Line Items]
Net operating loss carryforwards, expiration year	2024
U.S. Federal | Maximum
Income Taxes [Line Items]
Net operating loss carryforwards, expiration year	2033
State
Income Taxes [Line Items]
Net operating loss carryforwards (restated)	138,010
Net operating loss carryforwards expiration date description	expire between 2014 and 2033
Net operating loss carryforwards, expiration amount	7,991
State | Minimum
Income Taxes [Line Items]
Net operating loss carryforwards, expiration year	2014
Federal alternative tax credit carryover	451
State | Maximum
Income Taxes [Line Items]
Net operating loss carryforwards, expiration year	2033
Federal
Income Taxes [Line Items]
Net operating loss carryforwards, expiration amount	$ 7,894