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Temporary Differences in Financial Statement Carrying Amounts and Tax Bases of Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax asset |  |
Inventories | $ 5,359 | $ 5,949
State income taxes | 213 | (215)
Program accrual | 12,318 | 12,598
Vacation pay accrual | 818 | 796
Accrued bonuses | 2,072 | 543
Bad debt | 6 | 45
Stock compensation | 1,614 | 1,781
Tax credit | 14 | 524
Other | 2,707 | 1,659
Deferred tax asset | 25,472 | 24,338
Deferred tax liability |  |
NOL carryforward | 351 | 658
Plant and equipment, principally due to differences in depreciation and capitalized interest | 30,636 | 30,038
Prepaid expenses | 1,542 | 1,157
Deferred tax liability | 32,178 | 31,195
Total net deferred tax liability | $ 6,706 | $ 6,857

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