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Segment Disclosures - Schedule of Revenue from External Customers (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenue | $ 157,022 us-gaap_Revenues | $ 180,269 us-gaap_Revenues | $ 177,466 us-gaap_Revenues | $ 204,726 us-gaap_Revenues | $ 146,652 us-gaap_Revenues | $ 165,145 us-gaap_Revenues | $ 168,296 us-gaap_Revenues | $ 197,078 us-gaap_Revenues | $ 719,483 us-gaap_Revenues | $ 677,171 us-gaap_Revenues | $ 612,689 us-gaap_Revenues
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenue |  |  |  |  |  |  |  |  | 717,865 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 675,467 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 611,034 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US
Canada [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenue |  |  |  |  |  |  |  |  | $ 1,618 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CA | $ 1,704 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CA | $ 1,655 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CA

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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