Business Segments and Geographic Areas - Summary of Company's Revenues from External Customers and Long-Lived Assets, by Geographical Areas (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 |
|
| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||||||||
| Total operating revenues | $ 186,751 | $ 214,733 | $ 198,547 | $ 204,197 | $ 210,760 | $ 216,294 | $ 212,145 | $ 197,071 | $ 804,228 | $ 836,270 | $ 856,500 |
| Total Long-Lived Assets | 883,529 | 877,818 | 883,529 | 877,818 | |||||||
| United States [Member] | |||||||||||
| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||||||||
| Total operating revenues | 722,339 | 747,063 | 699,298 | ||||||||
| Total Long-Lived Assets | 773,939 | 846,377 | 773,939 | 846,377 | |||||||
| International [Member] | |||||||||||
| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||||||||
| Total operating revenues | 81,889 | 89,207 | $ 157,202 | ||||||||
| Total Long-Lived Assets | $ 109,590 | $ 31,441 | $ 109,590 | $ 31,441 | |||||||