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Goodwill, Intangible Assets and In-Process Revenue Contracts - Summary of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 317,964 $ 317,964
Accumulated Amortization (210,066) (191,828)
Net Carrying Amount 107,898 126,136
Customer contracts [Member]
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 316,684 316,684
Accumulated Amortization (209,786) (191,587)
Net Carrying Amount 106,898 125,097
Other intangible assets [Member]
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 1,280 1,280
Accumulated Amortization (280) (241)
Net Carrying Amount $ 1,000 $ 1,039