Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred Income Tax Assets And Liabilities [Line Items]
Asset reserves and liabilities not yet deductible for tax	$ 11,284	$ 12,198
Net current deferred tax assets	11,284	12,198
Current deferred tax liabilities, Other	(2,043)	(4,176)
Net total current deferred tax assets	9,241	8,022
Asset reserves and liabilities not yet deductible for tax	17,372	24,392
Tax over book basis of certain assets	897	13,994
Net operating loss and tax credit carryforwards	4,575	8,843
Intangible contract value	3,024
Noncurrent deferred tax assets, Other	705	261
Total noncurrent deferred tax assets	26,573	47,490
Less valuation allowance	(4,497)	(2,655)
Net noncurrent deferred tax assets	22,076	44,835
Book over tax basis of certain assets	(9,067)	(184,334)
Intangible lease value	(9,894)
Deferred tax liabilities, other	(37)	(27)
Total noncurrent deferred tax liabilities	(18,998)	(184,361)
Non-current deferred tax assets	$ 3,078	$ (139,526)