Stock-Based Compensation - Summary of Stock Options Outstanding and Exercisable (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares Under Options, Outstanding at January 1, 2013	1,166,421
Shares Under Options, Granted	173,750	164,500	176,250
Shares Under Options, Exercised	(15,334)
Shares Under Options, Forfeited	(123,084)
Shares Under Options, Outstanding at December 31, 2013	1,201,753	1,166,421
Shares Under Options, Exercisable at December 31, 2013	869,586
Shares Under Options, Vested or expected to vest at December 31, 2013	1,174,266
Weighted Average Exercise Price, Outstanding at January 1, 2013	$ 26.00
Weighted Average Exercise Price, Granted	$ 17.16	$ 17.67	$ 25.18
Weighted Average Exercise Price, Exercised	$ 13.93
Weighted Average Exercise Price, Forfeited	$ 26.25
Weighted Average Exercise Price, Outstanding at December 31, 2013	$ 24.85	$ 26.00
Weighted Average Exercise Price, Exercisable at December 31, 2013	$ 27.18
Weighted Average Exercise Price, Vested or expected to vest at December 31, 2013	$ 24.95
Remaining Contractual Life In Years, Outstanding at January 1, 2013	6 years 6 months	7 years 1 month 6 days
Remaining Contractual Life In Years, Outstanding at December 31, 2013	6 years 6 months	7 years 1 month 6 days
Remaining Contractual Life In Years, Exercisable at December 31, 2013	5 years 8 months 12 days
Remaining Contractual Life In Years, Vested or expected to vest at December 31, 2013	6 years 6 months
Intrinsic Value, Outstanding at January 1, 2013	$ 1,178
Intrinsic Value, Outstanding at December 31, 2013	982	1,178
Intrinsic Value, Exercisable at December 31, 2013	982
Intrinsic Value, Vested or expected to vest at December 31, 2013	$ 982