Income Taxes - Components of Deferred Income Tax Assets (Liabilities) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Deferral of book costs	$ (1,748)	$ (1,810)
Property and equipment	(1,807)	(6,416)
Pension	(10,566)	(2,712)
Other	(1,189)	(2,308)
Gross deferred tax (liabilities)	(15,310)	(13,246)
Deferred revenue	10,902	14,687
Accounts receivable	3,551	6,073
Legal accrual	3,455	2,018
Compensation and benefits	3,316	1,643
Stock-based compensation	20,794	22,680
Operating leases	2,386	735
Legal settlement accrual	0	17,834
Other assets	8,356	18,772
Other contingent liabilities	108,423	30,822
Gross deferred tax assets	161,183	115,264
Net deferred income tax asset	$ 145,873	$ 102,018