v3.5.0.2

Condensed Consolidating Financial Information - Guarantor Subsidiaries - Condensed Consolidating Statements of Cash Flows (Detail) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash (used in) provided by operating activities |  | $ 799 | $ 69,308
Investing activities: |  |  |
Purchase of property and equipment |  | (39,908) | (29,502)
Proceeds from asset dispositions |  | 10,998 | 567
Purchase of short-term investments |  | (151,436) | (290,469)
Proceeds from sale of short-term investments |  | 148,838 | 257,454
Payments of deposits on aircraft |  | (131) | (131)
Net cash used in investing activities |  | (31,639) | (62,081)
Financing activities: |  |  |
Proceeds from line of credit |  | 150,800 | 119,740
Payments on line of credit |  | (113,300) | (127,240)
Repurchase of common stock for payroll tax withholding requirements |  | (500) | (2,338)
Net cash provided by (used in) financing activities |  | 37,000 | (9,838)
Increase (decrease) in cash |  | 6,160 | (2,611)
Cash, beginning of period |  | 2,407 | 6,270
Cash, end of period |  | 8,567 | 3,659
Parent Company Only (issuer) [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash (used in) provided by operating activities |  | (12,954) | 46,696
Investing activities: |  |  |
Purchase of property and equipment |  | (39,535) | (29,502)
Proceeds from asset dispositions |  | 10,998 | 567
Purchase of short-term investments |  | (151,436) | (290,469)
Proceeds from sale of short-term investments |  | 148,838 | 257,454
Payments of deposits on aircraft |  | (131) | (131)
Net cash used in investing activities |  | (31,266) | (62,081)
Financing activities: |  |  |
Proceeds from line of credit |  | 150,800 | 119,740
Payments on line of credit |  | (113,300) | (127,240)
Repurchase of common stock for payroll tax withholding requirements |  | (500) | (2,338)
Due to/from affiliate, net |  | 7,214 | 25,220
Net cash provided by (used in) financing activities |  | 44,214 | 15,382
Increase (decrease) in cash |  | (6) | (3)
Cash, beginning of period |  | 46 | 51
Cash, end of period |  | 40 | 48
Guarantor Subsidiaries [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash (used in) provided by operating activities | [1] | 13,753 | 22,612
Investing activities: |  |  |
Purchase of property and equipment | [1] | (373) |
Net cash used in investing activities | [1] | (373) |
Financing activities: |  |  |
Due to/from affiliate, net | [1] | (7,214) | (25,220)
Net cash provided by (used in) financing activities | [1] | (7,214) | (25,220)
Increase (decrease) in cash | [1] | 6,166 | (2,608)
Cash, beginning of period | [1] | 2,361 | 6,219
Cash, end of period | [1] | $ 8,527 | $ 3,611
[1] | Foreign subsidiaries represent minor subsidiaries and are included in the guarantor subsidiaries' amounts.

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