Quarterly Results of Operations - Impact of Change in Accounting Method (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011
Quarterly Impact Of Changes In Accounting Method [Line Items]
Benefit (provision) for income taxes	$ 36,767	$ (55)	$ 36,483	$ (792)	[1]	$ (1,816)	[1]
Previous Accounting Guidance [Member]
Quarterly Impact Of Changes In Accounting Method [Line Items]
Benefit (provision) for income taxes	30,635
Adoption of New Accounting Method [Member]
Quarterly Impact Of Changes In Accounting Method [Line Items]
Benefit (provision) for income taxes	$ 36,767

[1] See Note 1 "Significant Accounting Policies - Intangible Assets" of Notes to Consolidated Financial Statements.