Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Adjustment of Transactions Revenue (Detail)

v3.3.1.900
Summary of Significant Accounting Policies - Adjustment of Transactions Revenue (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenue Recognition [Abstract]                      
Gross service revenues                 $ 225,057 $ 224,460 $ 173,784
Total contractual adjustments and discounts                 (125,255) (137,391) (107,317)
Net service revenues $ 27,280 $ 25,126 $ 24,370 $ 23,026 $ 25,000 $ 23,217 $ 20,670 $ 18,182 $ 99,802 $ 87,069 $ 66,467